zulko.github.io
No paid content found
Categories: Development
Yet another big problem of the Internet era tackled by Mathematics.
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Updated: 2026-10-06 17:32
Language: English (default)
Access: Normal
Profile views 2
Outbound visits 1
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Website Overview
An established domain and managed infrastructure suggest continuity of operations and may support dependable delivery, although neither guarantees service quality.
Domain and Registration
Registered in 2013, this domain has about 13 years of history. That suggests continuity, although ownership and purpose may have changed. The registrar, MarkMonitor Inc., specializes in corporate domain and brand management, suggesting attention to domain asset protection. Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The domain uses the common .io extension, which is not an independent safety signal.
DNS and Email
Nameservers are provided by Amazon Route 53, indicating managed DNS hosting. CAA records restrict which certificate authorities are authorized to issue certificates. 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. 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 checked browser-security headers were not detected, leaving fewer explicit browser-side safeguards. 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 jQuery, Fastly without precise versions, leaving fewer clues for version-specific scanning.
Search and Social Sharing
No Open Graph metadata was detected, so social previews may depend on platform inference. The title has 15 characters, within a common display range. A meta description is present, with 67 characters. The observed directives allow indexing and link following. No Generator meta tag is publicly exposed.
Hosting and Email
Amazon Route 53
Hosting
Fastly
Location
United States
Pages, Search and Sharing
| Meta description | Yet another big problem of the Internet era tackled by Mathematics. |
|---|---|
| Canonical URL | http://Zulko.github.io |
| Language | English (default) |
| Twitter Card | Not detected |
Unknown
robots.txt (opens in a new tab)
0 rules
All bots 0 allowed · 0 disallowed
All bots
No matching rules.
Sitemaps
1
Registration details RDAP / WHOIS
| Registrar | MarkMonitor Inc. |
|---|---|
| Registered | 2013-03-08 |
| Expires | 2027-03-08 |
| Domain status | clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited、clientTransferProhibited https://icann.org/epp#clientTransferProhibited、clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited |
| Nameservers | dns1.p05.nsone.net、dns2.p05.nsone.net、dns3.p05.nsone.net、ns-1622.awsdns-10.co.uk、ns-692.awsdns-22.net |
| DNSSEC | unsigned |
DNS records
| Type | Name | Value | TTL | Priority |
|---|---|---|---|---|
| A | zulko.github.io | 185.199.108.153 | 3600 | — |
| A | zulko.github.io | 185.199.109.153 | 3600 | — |
| A | zulko.github.io | 185.199.110.153 | 3600 | — |
| A | zulko.github.io | 185.199.111.153 | 3600 | — |
| AAAA | zulko.github.io | 2606:50c0:8000::153 | 3600 | — |
| AAAA | zulko.github.io | 2606:50c0:8001::153 | 3600 | — |
| AAAA | zulko.github.io | 2606:50c0:8002::153 | 3600 | — |
| AAAA | zulko.github.io | 2606:50c0:8003::153 | 3600 | — |
| NS | github.io | dns1.p05.nsone.net | 2014 | — |
| NS | github.io | dns2.p05.nsone.net | 2014 | — |
| NS | github.io | dns3.p05.nsone.net | 2014 | — |
| NS | github.io | dns4.p05.nsone.net | 2014 | — |
| NS | github.io | ns-1339.awsdns-39.org | 2014 | — |
| NS | github.io | ns-1622.awsdns-10.co.uk | 2014 | — |
| NS | github.io | ns-393.awsdns-49.com | 2014 | — |
| NS | github.io | ns-692.awsdns-22.net | 2014 | — |
| TXT | github.io | v=spf1 a -all | 3600 | — |
| CAA | github.io | 0 issue "digicert.com" | 3600 | — |
| CAA | github.io | 0 issue "letsencrypt.org" | 3600 | — |
| CAA | github.io | 0 issue "sectigo.com" | 3600 | — |
| CAA | github.io | 0 issuewild "digicert.com" | 3600 | — |
| CAA | github.io | 0 issuewild "letsencrypt.org" | 3600 | — |
| CAA | github.io | 0 issuewild "sectigo.com" | 3600 | — |
TLS and certificates
| Assessment | Normal configuration |
|---|---|
| Supported protocols | TLSv1.2、TLSv1.3 |
| Negotiated protocol | TLSv1.3 |
| Certificate subject | *.github.io |
| Issuer | Let's Encrypt |
| Valid until | 2026-10-31T23:38 · Remaining when checked: 25 days |
| Verification details | Certificate trust: Passed · Hostname match: Passed |
HTTP response headers
| Header | Value |
|---|---|
| content-type | text/html; charset=utf-8 |
| cache-control | max-age=600 |
| server | GitHub.com |
| access-control-allow-origin | * |
Identified technologies
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