Hostname
firstclass.cz
Last fetched
firstclass.cz resolves to 3 IPv4 addresses operated by CLOUDFLARENET - Cloudflare, Inc. in CA. WHOIS lists registrar:reg-active24 as the registrar.
Nutrition Label
Resolution chain
firstclass.cz resolves to 3 distinct IPv4 addresses via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.
| IP | Prefix | ASN | Operator | Country |
|---|---|---|---|---|
| 104.26.8.126 | 104.26.0.0/20 | AS13335 | CLOUDFLARENET - Cloudflare, Inc. | CA |
| 104.26.9.126 | 104.26.0.0/20 | AS13335 | CLOUDFLARENET - Cloudflare, Inc. | CA |
| 172.67.72.143 | 172.67.64.0/20 | AS13335 | CLOUDFLARENET - Cloudflare, Inc. | CA |
WHOIS identity
- Registrar
- registrar:reg-active24
- Organization
- first class publishing a.s.
- Contact emails
- —
Subdomains
13 observed subdomains of firstclass.cz.
Web-graph footprint
Distinct hostnames that link to or from firstclass.cz in the public web crawl.
254 sites link to this hostname.
64 sites linked to from this hostname.
Sample inbound links
Sample outbound links
Threat posture
History
Mail and authentication
MX records
SPF policy
2 SPF mechanisms authorising senders for firstclass.cz.
| Mechanism | Target |
|---|---|
| SPF_INCLUDE | _spf.smtp.com |
| SPF_INCLUDE | zoho.eu |
Related pages
Pivot deeper into the graph from firstclass.cz.
Cypher and MCP
Reproduce the resolution chain directly against graph.whisper.security:
MATCH (h:HOSTNAME {name: "firstclass.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.