Hostname
blu.cz
Last fetched
blu.cz resolves to 4 IPv4 addresses operated by AS20940 in CH.
Nutrition Label
Resolution chain
blu.cz resolves to 4 distinct IPv4 addresses via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.
| IP | Prefix | ASN | Operator | Country |
|---|---|---|---|---|
| 2.21.22.17 | 2.21.22.0/24 | AS20940 | — | CH |
| 2.21.22.49 | 2.21.22.0/24 | AS20940 | — | CH |
| 23.200.143.72 | 23.200.143.0/24 | AS20940 | — | HK |
| 23.200.143.77 | 23.200.143.0/24 | AS20940 | — | HK |
WHOIS identity
No WHOIS records are currently associated with blu.cz in WhisperGraph.
Subdomains
5 observed subdomains of blu.cz.
| Subdomain |
|---|
| mail.blu.cz |
| shop.blu.cz |
| www.blu.cz |
Showing 3 of 5. View all subdomains →
Threat posture
History
Mail and authentication
MX records
SPF policy
4 SPF mechanisms authorising senders for blu.cz.
| Mechanism | Target |
|---|---|
| SPF_INCLUDE | mail.zendesk.com |
| SPF_INCLUDE | spf.protection.outlook.com |
| SPF_INCLUDE | spf1.imptob.com |
| SPF_INCLUDE | spf2.imptob.com |
Related pages
Pivot deeper into the graph from blu.cz.
Cypher and MCP
Reproduce the resolution chain directly against graph.whisper.security:
MATCH (h:HOSTNAME {name: "blu.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.