Hostname
blue4.cz
Last fetched
blue4.cz resolves to 1 IPv4 address operated by AS198346 in CZ. WHOIS lists iana:1362 as the registrar.
Nutrition Label
Resolution chain
blue4.cz resolves to 1 distinct IPv4 address via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.
| IP | Prefix | ASN | Operator | Country |
|---|---|---|---|---|
| 91.222.52.36 | 91.222.52.0/24 | AS198346 | — | CZ |
WHOIS identity
- Registrar
- iana:1362
- Organization
- antonin mlejnek
- Contact emails
Subdomains
1,024 observed subdomains of blue4.cz.
Showing 25 of 1,024. View all subdomains →
Web-graph footprint
Distinct hostnames that link to or from blue4.cz in the public web crawl.
Sample inbound links
Threat posture
History
Mail and authentication
MX records
SPF policy
5 SPF mechanisms authorising senders for blue4.cz.
| Mechanism | Target |
|---|---|
| SPF_A | blue4.cz |
| SPF_A | fw.blue4.cz |
| SPF_A | posta.edera.cz |
| SPF_A | smtp.blue4.cz |
| SPF_MX | blue4.cz |
Related pages
Pivot deeper into the graph from blue4.cz.
Cypher and MCP
Reproduce the resolution chain directly against graph.whisper.security:
MATCH (h:HOSTNAME {name: "blue4.cz"})-[:RESOLVES_TO]->(ip:IPV4)
-[:ANNOUNCED_BY]->(ap:ANNOUNCED_PREFIX)
-[:ROUTES]->(asn:ASN)-[:HAS_NAME]->(n:ASN_NAME)
RETURN ip.name AS ip, ap.name AS prefix, asn.name AS asn, n.name AS operator
LIMIT 20Or query Whisper from your own LLM workflow via the Whisper MCP server.