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IPv4 address

81.91.91.39

Last fetched

81.91.91.39 is announced in 81.91.88.0/21 by WEB4U - Web4U s.r.o. and geolocates to CZ. 81.91.91.39 is not listed on any threat feed indexed by WhisperGraph; reconciled level NONE.

Threat posture

0threat score (procedure-native scale)

NONE

No threats observed.

Threat feeds listing this
0
Verdict coverage
no-data

Nutrition Label

WHISPER CANON · 81.91.91.39Routing diversity4.8/10Peering density4.2/10MOAS conflict✓ noneThreat-feed listings10.0/10WHOIS transparency—Resolver footprint—canon.whisper.security/ip/81.91.91.39

Attribution

Announced prefix
81.91.88.0/21
Announcing network
WEB4U - Web4U s.r.o.
RIR-registered prefix
81.91.80.0/20
RPKI
valid

Anycast detection

This does not appear to be an anycast address on the three signals Canon evaluates: reverse DNS, announced-prefix width and the announcing network's peer count.

Reverse DNS

Geographic detail

City
Prague, CZ
Country
CZ

Threat-feed evidence

History

Related pages

Pivot from 81.91.91.39 into the prefix, network and country that carry it.

Cypher and MCP

Reproduce this address's routing attribution against graph.whisper.security:

MATCH (ip:IPV4 {name: "81.91.91.39"})
OPTIONAL MATCH (ip)-[:ANNOUNCED_BY]->(ap:ANNOUNCED_PREFIX)-[:ROUTES]->(a:ASN)
OPTIONAL MATCH (a)-[:HAS_NAME]->(n:ASN_NAME)
OPTIONAL MATCH (ip)-[:HAS_COUNTRY]->(c:COUNTRY)
RETURN ap.name AS prefix, a.name AS asn, n.name AS network, c.name AS country

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