Hostname

proobec.cz

Last fetched Wed, 29 Jul 2026 22:54:14 GMT

proobec.cz resolves to 1 IPv4 address operated by AS39790 in CZ. WHOIS lists registrar:reg-web4u as the registrar.

Nutrition Label

Resolution chain

proobec.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
81.91.86.44	81.91.80.0/21	AS39790	—	CZ

WHOIS identity

Registrar: registrar:reg-web4u
Organization: trolljets, s.r.o.
Contact emails: —

Subdomains

11 observed subdomains of proobec.cz.

Subdomain
era.proobec.cz
helpdesk.proobec.cz
mail.proobec.cz
servicedesk.proobec.cz
smlouvy.proobec.cz
wildcard.proobec.cz
www.proobec.cz
zakazky.proobec.cz

Showing 8 of 11. View all subdomains →

Web-graph footprint

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

8 sites link to this hostname.

15 sites linked to from this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

SPF policy

5 SPF mechanisms authorising senders for proobec.cz.

Mechanism	Target
SPF_A	mail.metronet.cz
SPF_A	smtp.metronet.cz
SPF_INCLUDE	_spf.web4u.cz
SPF_INCLUDE	spf.protection.outlook.com
SPF_MX	proobec.cz

Pivot deeper into the graph from proobec.cz.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "proobec.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.