Hostname

ercool.cz

Last fetched Mon, 03 Aug 2026 20:42:31 GMT

ercool.cz resolves to 1 IPv4 address operated by OVANET - OVANET in CZ. WHOIS lists registrar:reg-internet-cz as the registrar.

Nutrition Label

Resolution chain

ercool.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
81.91.216.142	81.91.208.0/20	AS39817	OVANET - OVANET	CZ

WHOIS identity

Registrar: registrar:reg-internet-cz
Organization: ing. stanislav richtar
Contact emails: —

Subdomains

5 observed subdomains of ercool.cz.

Subdomain
async.ercool.cz
gw142.ercool.cz
gw143.ercool.cz
mbox.ercool.cz
smtpf.ercool.cz

Web-graph footprint

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

10 sites linked to from this hostname.

Sample outbound links

Threat posture

History

Mail and authentication

MX records

SPF policy

2 SPF mechanisms authorising senders for ercool.cz.

Mechanism	Target
SPF_IP	81.91.216.140
SPF_IP	81.91.216.143

Pivot deeper into the graph from ercool.cz.

Cypher and MCP

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

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