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a2a-protocol.org
The official documentation for the Agent2Agent (A2A) protocol. The A2A protocol is an open standard that allows different AI agents to securely communicate, collaborate, and solve complex problems together.
At a glance
- Category
- Artificial Intelligence
- Language
- English
- Paid-content signal
- No paid content foundObserved
- Registered
- 2025
- Hosting
- FastlyInferred
- HTTPS certificate trusted
- PassedObserved
- Last updated
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Website Overview
Several search or sharing settings need attention. Together they may make snippets, preview images or preferred URLs less consistent across platforms.
Domain and Registration
Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The domain has about 1 years of registration history; its current configuration provides more context than age alone. The registrar is GoDaddy.com, LLC, a widely used domain service provider. The domain uses the common .org extension, which is not an independent safety signal.
DNS and Email
Nameservers are provided by GoDaddy, indicating managed DNS hosting. No CNAME was found; the observed records resolve directly to addresses. No MX record was found. A conventional explicit inbound-mail route is not configured. TXT records include verification markers for Google. Such markers may also remain after a service stops being used. DNSSEC signatures were not detected, so this additional DNS authenticity protection is not confirmed.
TLS and Certificates
The certificate uses an RSA 2048-bit public key, offering broad client compatibility. The server supplied a complete certificate chain. No organization name is present in the certificate; the available fields are consistent with domain validation. The certificate was issued by Let's Encrypt, commonly associated with automated certificate services. The certificate's total validity is about 89 days, consistent with a short renewal cycle.
HTTP and Browser Security
The response lacks these common security headers: CSP, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, clickjacking protection. CORS permits any origin to read this response. This is common for public resources; sensitive responses need narrower handling. No X-Powered-By header was found, reducing one common source of backend fingerprinting information. The x-cache, x-served-by, via response header indicates a CDN or caching proxy in the delivery path. No obvious internal addresses or debug information were found in the headers.
Technology Stack Analysis
The public page identifies Fastly without precise versions, leaving fewer clues for version-specific scanning.
Search and Social Sharing
No homepage meta description was detected, leaving snippet selection more dependent on page text. No viewport meta tag was detected, which may affect mobile layout behavior. No homepage canonical URL was detected. If duplicate URLs exist, consolidation may be less explicit. No Open Graph metadata was detected, so social previews may depend on platform inference. The title has 11 characters, within a common display range.
Hosting and Email
GoDaddy
Fastly
United States
Inferred
185.199.108.153
Registration details
| Registrar | GoDaddy.com, LLC |
|---|---|
| Registered | 2025-07-04 |
| Expires | 2027-07-04 |
| Domain status | client delete prohibited、client renew prohibited、client transfer prohibited、client update prohibited |
| Nameservers | ns29.domaincontrol.com、ns30.domaincontrol.com |
| DNSSEC | unsigned |
DNS records
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
| A | a2a-protocol.org | 185.199.108.153 | 43200 | — |
| A | a2a-protocol.org | 185.199.109.153 | 43200 | — |
| A | a2a-protocol.org | 185.199.110.153 | 43200 | — |
| A | a2a-protocol.org | 185.199.111.153 | 43200 | — |
| NS | a2a-protocol.org | ns29.domaincontrol.com | 3600 | — |
| NS | a2a-protocol.org | ns30.domaincontrol.com | 3600 | — |
| TXT | a2a-protocol.org | google-site-verification=ma3lMV24Sj7eA0evUElX6Wl2KG3dRPePBLxfH82yJJw | 3600 | — |
| DMARC | _dmarc.a2a-protocol.org | v=DMARC1; p=reject; adkim=r; aspf=r; rua=mailto:[email protected]; | 3600 | — |
TLS and certificates
HTTP response headers
| Header | Value |
|---|---|
| content-type | text/html; charset=utf-8 |
| cache-control | max-age=600 |
| server | GitHub.com |
| strict-transport-security | max-age=31556952 |
| access-control-allow-origin | * |
Identified technologies
Pages, Search and Sharing
| Meta description | Not detected |
|---|---|
| Canonical URL | Not detected |
| Language | English (default) |
| Twitter Card | Not detected |
Unknown
robots.txt (opens in a new tab)
11 rulesAll bots 1 allowed · 0 disallowed
- Allow
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gptbot 1 allowed · 0 disallowed
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chatgpt-user 1 allowed · 0 disallowed
- Allow
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claudebot 1 allowed · 0 disallowed
- Allow
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claude-web 1 allowed · 0 disallowed
- Allow
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perplexitybot 1 allowed · 0 disallowed
- Allow
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facebookbot 1 allowed · 0 disallowed
- Allow
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applebot 1 allowed · 0 disallowed
- Allow
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google-extended 1 allowed · 0 disallowed
- Allow
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googleother 1 allowed · 0 disallowed
- Allow
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duckassistbot 1 allowed · 0 disallowed
- Allow
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No matching rules.
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