Hostname

bcsn.cz

Last fetched Tue, 30 Jun 2026 20:55:10 GMT

bcsn.cz resolves to 1 IPv4 address operated by AS15685 in CZ. WHOIS lists registrar:reg-zoner as the registrar.

Nutrition Label

Resolution chain

bcsn.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
109.123.222.131	109.123.216.0/21	AS15685	—	CZ

WHOIS identity

Registrar: registrar:reg-zoner
Organization: public agency, s.r.o.
Contact emails: —

Subdomains

1 observed subdomain of bcsn.cz.

Subdomain
www.bcsn.cz

Web-graph footprint

Distinct hostnames that link to or from bcsn.cz in the public web crawl.

11 sites linked to from this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

server.jerewan.cz

SPF policy

4 SPF mechanisms authorising senders for bcsn.cz.

Mechanism	Target
SPF_A	bcsn.cz
SPF_INCLUDE	spf.blueboard.cz
SPF_IP	109.123.222.131
SPF_MX	bcsn.cz

Pivot deeper into the graph from bcsn.cz.

Cypher and MCP

Reproduce the resolution chain directly against graph.whisper.security:

MATCH (h:HOSTNAME {name: "bcsn.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 20

Or query Whisper from your own LLM workflow via the Whisper MCP server.