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XMPP (Extensible Messaging and Presence Protocol), historically called Jabber, is an open instant messaging protocol. A public XMPP server such as Jabbim gives you a Jabber address and connects you to other XMPP users and networks. You use it by registering an account on the server, then signing in with any XMPP client — desktop or mobile. Jabbim states its services are free of charge, and it offers gateways to other networks plus its own local services.

What XMPP actually is

XMPP is a messaging protocol, not an app. The server handles your account and message routing; the client is the software you install. That separation is the main practical difference from closed messengers:

• Open protocol — you choose your own client instead of being locked to one vendor's app.
• Interoperability — Jabbim says its users can chat with users of other XMPP-enabled services and public Jabber servers, naming Google Talk, LiveJournal Talk, WP Spik, Gizmo Project, and Tipic IM among them.
• Encryption — Jabbim states it uses encryption to protect your messages.
• Mobility — the same account works from a desktop, a notebook, a PDA, or a mobile phone; Jabbim frames this as paying for transmitted data rather than SMS.

What a public server like Jabbim provides

Jabbim describes itself as an instant messaging service that lets you send messages to friends in almost real time. Beyond basic messaging, the site lists:

• Transports and gateways to other networks: AIM, Yahoo!, Skype, ICQ, Twitter, Facebook, and a Telegram gateway.
• Up to 1 GB of data storage.
• Multi-user conference with live community support.
• Local services for Czech, Polish, and Slovak users — train and bus timetables, dictionaries, SMS gateways, TV schedules.
• A weather forecast and a status icon you can embed on your own website.
• No ads, no spam, per the site's own description.

Jabbim also offers a VIP/sponsor program. The site links to pages explaining how to become a sponsor and what you get in return, and lists PayPal as a payment platform. Treat the free tier and the VIP tier as separate things: the general service is described as free, while VIP is a sponsorship arrangement with its own terms on those pages.

How to get started

1. Register an account. Jabbim's site has a registration entry point ("Register!"). You'll end up with a Jabber ID in the form [email protected], which is the address other people use to reach you.
2. Install an XMPP client. Jabbim's download section points to clients including Pidgin and Psi+ (Psi+ is recommended for the Tor setup described below). You can also use a web client from the site.
3. Sign in. Enter your full Jabber ID and password in the client. The client connects to the Jabbim server, and your contacts see you as online.
4. Add contacts and message. Add other Jabber IDs — on Jabbim or on any other XMPP server — and start chatting.
5. Set up gateways if you need them. In your client, use service discovery to find the gateway you want. For Telegram specifically, Jabbim's instructions are: in your client, use service discovery and register your phone number in international format at telegram.jabbim.com.

Expected result: after step 3 you have a working account and can exchange messages; after step 5 you can reach contacts on the bridged networks from the same client.

Connecting over Tor

Jabbim supports connection via Tor. The site gives this onion address and port:

mrbenqxl345o4u7yaln25ayzz5ut6ab3kteulzqusinjdx6oh7obdlad.onion:5222

After installing Tor, configure your client to use a Socks5 proxy at 127.0.0.1 with port 9050 (Tor client) or 9150 (Tor Browser), and use the hostname above. Psi+ is the recommended client for this.

Practical things to watch

• Certificate validation. Jabbim's flash news notes that from 30 September 2021 some users may have had problems validating the server certificate, and advises updating client software (Pidgin, Psi+ are named). If you hit a certificate error, updating the client is the first thing to try.
• Server status. The site maintains a server status page — worth checking if connections fail, since the problem may be on the server side rather than your client.
• Account and terms. Registration and use are governed by the site's terms of use; read them before relying on the service for anything important.
• Client choice matters. Because XMPP is open, features like service discovery, gateway registration, and proxy settings live in the client, not the server. If a step above doesn't match your client's menus, the client's own documentation is the place to look.

Who this suits

Jabbim fits you if you want a free public XMPP account, value choosing your own client, and need gateways to networks like ICQ, Telegram, or Facebook — or if you're in the Czech, Polish, or Slovak region and want the local timetable, dictionary, and SMS services. If you only need to message people who all use one closed app, a public XMPP server adds setup steps without an obvious payoff.

njs.netlab.cz is not a website you visit — it is a service hostname used inside the Jabbim XMPP/Jabber ecosystem, the kind of address you enter in an XMPP client when you want to reach a specific component such as a transport or gateway. You use it by adding it as a service address in your client (often through service discovery), not by opening it in a browser. This applies if you already have a Jabbim account or another XMPP account and want to connect to a Jabbim-hosted service.

Why a hostname like njs.netlab.cz appears in XMPP

XMPP is built from separate pieces that talk to each other:

• Your account lives on a server, for example a Jabbim address.
• Components (transports, gateways, bots, conference services) run as separate addresses on their own hostnames.
• Service discovery lets your client ask the server which components exist and how to reach them.

So when you see a name like njs.netlab.cz, it is usually the address of one such component rather than a page to browse. Jabbim's own documentation shows this pattern with its Telegram gateway, which you reach by registering at telegram.jabbim.com through service discovery.

How to use a Jabbim service hostname in your client

The exact menus differ by client, but the flow is the same. Using the documented Telegram gateway as the concrete example:

1. Sign in to your XMPP account in a client such as Psi+ or Pidgin.
2. Open service discovery (often called "Service Discovery", "Add service", or found under your account/server in the client menu).
3. Find the gateway in the list, or enter the hostname directly — for Telegram this is telegram.jabbim.com.
4. Register with the gateway. For Telegram, Jabbim's instructions say to register your phone number in international format.
5. Confirm the result: the gateway appears as a new contact or service in your roster, and messages route through it to the other network.

The same steps apply to any other component address you are given, including a hostname like njs.netlab.cz: add it as a service, register if required, then use it as a contact.

If you are connecting through Tor

Jabbim documents Tor support with a specific onion address and port:

• Onion host: mrbenqxl345o4u7yaln25ayzz5ut6ab3kteulzqusinjdx6oh7obdlad.onion, port 5222.
• In your client, set a Socks5 proxy to 127.0.0.1 with port 9050 (Tor client) or 9150 (Tor Browser), and use the onion hostname. Psi+ is recommended for this.

Common connection problems

Certificate validation errors. Jabbim's flashnews notes that from September 30, 2021, some users may hit certificate validation problems. The stated fix is to update your client software, with Pidgin and Psi+ named as examples. If a hostname fails to connect, updating the client is the first thing to try.

Wrong address type. A component hostname is not a web address. If you paste it into a browser and get nothing, that is expected — it belongs in your XMPP client's service or gateway field.

Registration required. Some gateways need you to register (for example, a phone number for Telegram) before they work. A gateway that appears but does not respond is often just unregistered.

What Jabbim is, and what it costs

Jabbim is a public XMPP/Jabber instant messaging service. Its stated features include:

• Open protocol, so you choose your own client.
• Interoperability with other XMPP services such as Google Talk, LiveJournal Talk, and Gizmo.
• No ads and no spam, per the site.
• Transports and gateways for AIM, Yahoo!, Skype, ICQ, Twitter, and Facebook, plus a Telegram gateway.
• Up to 1GB of data storage, weather forecasts, and local services for Czech, Polish, and Slovak users (timetables, dictionaries, SMS gateways, TV schedules).

Jabbim states its services are free of charge. It also offers a VIP sponsorship program, with pages on how to become a sponsor and what you get in return, and PayPal listed as a payment platform. Treat VIP as an optional sponsorship tier rather than a requirement for basic use.

Quick reference

If you are new to Jabbim, register an account first, then use service discovery to see which components your account can reach. If you were given a specific hostname, add it as a service and register if prompted.

Jabber is the original name for the open XMPP instant messaging protocol, and a public Jabber server like Jabbim is a free service that hosts your account and routes your messages. You can use it if you want open, ad-free messaging where you pick your own client and can still reach people on other XMPP-based networks. Getting started means registering an account, installing an XMPP client, and signing in with a Jabber ID in the form user@server.

Jabber and XMPP: the same thing, two names

Jabber was the name of the original open messaging protocol; XMPP (Extensible Messaging and Presence Protocol) is the standardized name it took on. In practice the terms are used interchangeably.

The key property is that XMPP is an open protocol, not a single company's product. That has two consequences:

• You choose your own client. Pidgin, Psi+, and many mobile apps can all connect to the same account.
• Servers interoperate. A user on one XMPP server can message a user on another, similar to how email works across providers.

Jabbim describes itself as an instant messaging service built on the XMPP/Jabber protocol, with encryption used to protect messages, and states that its services are free of charge.

What a public Jabber server actually does

A public server like Jabbim provides three things:

1. An account and message routing. You register a Jabber ID such as [email protected], and the server delivers messages between you and your contacts.
2. Interoperability with other networks. Because XMPP is open, Jabbim users can communicate with users of other XMPP-enabled services and public Jabber servers.
3. Optional gateways (transports) to closed networks. Jabbim lists gateways for AIM, Yahoo!, Skype, ICQ, Twitter, and Facebook, plus a Telegram gateway. These let you reach contacts on those networks from inside your XMPP client.

Jabbim also lists extras beyond chat: up to 1 GB of data storage, weather forecasts, a live community support conference, and local services for Czech, Polish, and Slovak users such as train and bus timetables, dictionaries, SMS gateways, and TV schedules.

Why people choose an open server over a single-vendor messenger

Jabbim's own reasons for using it map onto the general advantages of XMPP:

The trade-off to be aware of: because you assemble your own setup (server + client + gateways), you take on a bit more configuration than a single all-in-one app would require.

How to get started

The general flow for any public XMPP server, including Jabbim:

1. Register an account on the server. Jabbim's site offers a registration entry point.
2. Install an XMPP client. Jabbim points to Pidgin and Psi+ (and recommends Psi+ for its Tor instructions), and also offers a web client if you don't want to install anything.
3. Sign in with your Jabber ID (user@server) and password.
4. Add contacts using their Jabber IDs, the same way you'd add an email address.
5. Verify it works by sending a message to a contact or joining a multi-user conference.

Adding a gateway to another network

To reach contacts on a closed network, you register a transport through your client:

1. Open service discovery in your client.
2. Find the gateway you want — for example, Jabbim's Telegram gateway is at telegram.jabbim.com.
3. Register with it, entering your phone number in international format for Telegram.
4. Your contacts on that network then appear as XMPP contacts.

Common practical issues to expect

• Certificate validation errors after server updates. Jabbim notes that from September 30, 2021 some users may have had certificate validation problems, and the fix is to update your client software (it names Pidgin and Psi+). If you see a certificate warning, update the client before assuming the server is down.
• Gateways need per-network registration. A transport doesn't work until you register with it through service discovery; entering the wrong phone number format is a frequent cause of failure.
• Connecting over Tor. Jabbim supports Tor via an onion address on port 5222. After installing Tor, configure your client to use a Socks5 proxy at 127.0.0.1 with port 9050 (Tor client) or 9150 (Tor Browser), and use the provided onion hostname. Psi+ is recommended for this.

What to check before committing

• Client availability on your devices. Confirm an XMPP client you like exists for your phone and desktop.
• Which gateways you actually need. If your contacts are mostly on one closed network, check that Jabbim lists a gateway for it.
• Sponsorship terms. Jabbim separates a free service from a VIP/sponsor option; the site links to "How to become a sponsor?" and "What do I get in return?" if you want the details of the paid tier. The free service itself is stated as free of charge.

If open protocol, client choice, and cross-network reach matter more to you than a single polished app, a public XMPP server like Jabbim is a reasonable fit. If you'd rather not configure clients and gateways yourself, a single-vendor messenger will involve less setup.

jabber.cz is a domain associated with the Jabbim XMPP/Jabber service rather than a separate messaging server. If you want to use it, the practical path is to register an account on Jabbim (jabbim.com), connect with any XMPP client, and use the Jabbim services — including gateways to other networks and local tools for Czech, Polish, and Slovak users. Jabbim describes its services as free of charge.

What Jabbim actually is

Jabbim is a public instant messaging service built on the XMPP/Jabber protocol. It lets you send messages to friends in near-real time and, because XMPP is an open protocol, you can choose your own client instead of being locked into one app.

Key characteristics from the service's own description:

• Open protocol — pick whichever XMPP client you prefer.
• Interoperability — chat with users on other XMPP-enabled services and public Jabber servers, such as Google Talk, LiveJournal Talk, Gizmo, and others.
• No ads, no spam.
• Mobile use — connect from a phone and pay for data rather than SMS.
• Encryption — the service states it uses encryption to protect messages.
• Storage — up to 1GB of data storage.

How jabber.cz fits in

The domain appears among the service's associated keywords alongside jabbim and njs.netlab.cz. In practice this means jabber.cz is part of the same Jabbim ecosystem — a naming/domain association, not a distinct server you sign up for separately. To "use jabber.cz," you use Jabbim.

How to start using it

1. Register an account on Jabbim (the site's navigation includes a Register entry).
2. Choose and install an XMPP client. The service references Pidgin and Psi+ in its own notices.
3. Connect to the server using your new credentials.
4. Verify it works by sending a message to another XMPP user or joining a multi-user conference.

A note on certificates

Jabbim's flash news states that from September 30, 2021, some users may have had problems validating the service certificate, and advises updating client software (Pidgin, Psi+). If you hit connection or certificate errors, updating your client is the first thing to try.

Services and gateways you get

Jabbim offers transports/gateways so you can reach people on other networks from one client:

• AIM, Yahoo!, ICQ, Twitter, Facebook
• Skype (marked as new in the source)
• Telegram — register your phone number in international format at telegram.jabbim.com via service discovery in your client.

It also provides weather forecasts, live community support in an online multi-user conference, and local services for Czech, Polish, and Slovak users such as train and bus timetables, dictionaries, SMS gateways, and TV schedules.

Privacy option: connecting over TOR

Jabbim states it supports connection via TOR. The published onion address is:

mrbenqxl345o4u7yaln25ayzz5ut6ab3kteulzqusinjdx6oh7obdlad.onion

Port 5222. After installing TOR, use a Socks5 proxy at 127.0.0.1 with port 9050 (Tor client) or 9150 (Tor Browser), and enter that hostname in your client. Psi+ is recommended for this setup.

Sponsorship

Jabbim's site links to pages explaining how to become a sponsor and what you get in return, with PayPal listed as a payment platform. The service itself is described as free of charge; sponsorship is a separate, optional arrangement.

Quick reference

An XMPP/Jabber server is the piece of infrastructure that hosts your messaging account and routes messages between you and everyone else on the XMPP network. Jabbim is a free public XMPP/Jabber server you can register on, then connect to with any XMPP client you choose. You use it by creating an account, pointing a client at the server, and optionally adding gateways (transports) so you can also reach people on networks like Telegram, ICQ, or Facebook. This article explains how the server fits into the picture and walks through getting connected.

What an XMPP/Jabber server actually does

XMPP (the protocol formerly known as Jabber) is an open messaging standard. A server is the hub in that network:

• Hosts your account — your address looks like [email protected], where the part after the @ is the server.
• Routes messages — when you message someone on a different server, your server talks to theirs. This is why XMPP users on different providers can chat with each other.
• Stores your data — Jabbim offers up to 1GB of data storage per the site.
• Bridges to other networks — through transports/gateways, the server lets you reach contacts on non-XMPP services.

Because XMPP is an open protocol, the server and the client are separate choices. Jabbim's own pitch is exactly this: "Open protocol — choose your client yourself."

Why people pick a public server like Jabbim

The site lists several reasons users choose it:

Jabbim also states it uses encryption to protect messages and describes itself as among the world's most reliable XMPP/Jabber servers.

How to register and connect

1. Create an account. Go to the Jabbim site and use the Register option. You'll choose a username, which becomes your address ([email protected]).
2. Pick a client. The site offers a web client for browser-based use, plus downloads. It specifically points to Pidgin and Psi+ as clients — Psi+ is the one it recommends for the Tor setup below.
3. Log in. Enter your full Jabbim address and password in the client. The client connects to the Jabbim server and pulls your contact list.
4. Add contacts and chat. Add other XMPP addresses (on Jabbim or any other XMPP server) and start messaging.
5. Add gateways if you need them. In your client, use service discovery to find available transports, then register for the one you want. For example, to reach Telegram: in service discovery, register your phone number in international format at telegram.jabbim.com.

Expected result: after step 3 you're online and can message any XMPP user; after step 5 you can also message contacts on the bridged network.

Connecting over Tor (optional)

Jabbim supports connecting through Tor. The site gives this address and port:

• Onion host: mrbenqxl345o4u7yaln25ayzz5ut6ab3kteulzqusinjdx6oh7obdlad.onion, port 5222
• In your client, set a SOCKS5 proxy to 127.0.0.1 with port 9050 (Tor client) or 9150 (Tor Browser), and use the onion hostname above. Psi+ is recommended for this.

Common issues and troubleshooting

• Certificate validation errors. The site notes that from September 30, 2021 you may have had trouble validating its certificate, and the fix is to update your client software — it names Pidgin and Psi+.
• Gateway registration fails. Make sure you're entering your phone number (for Telegram) in international format, and that you're registering through service discovery rather than adding it as a normal contact.
• Tor connection won't start. Confirm the SOCKS5 proxy port matches your setup — 9050 for the Tor client, 9150 for Tor Browser — and that you're using the onion hostname, not the regular one.

Free vs. VIP

Jabbim states its services are free of charge. The site also has a VIP section with pages titled "How to become a sponsor?" and "What do I get in return?", and PayPal appears as a payment platform — so there is a sponsorship/VIP track alongside the free service. The site does not state VIP pricing on the pages referenced here, so check those pages directly if you want the current details.

Quick decision guide

• Choose Jabbim if you want a free public XMPP account, the freedom to pick your own client, and built-in gateways to networks like Telegram, ICQ, and Facebook.
• Look elsewhere if you need a provider with published uptime guarantees or you want a server outside the Czech/Polish/Slovak service focus — though the core XMPP chat itself is not region-limited.

To get started, register on the site, install Pidgin or Psi+, log in with your new @jabbim.com address, and add gateways through service discovery only if you need to reach other networks.