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Hostname

c21a.jp

Last fetched

c21a.jp resolves to 203.141.157.18, announced in 203.141.128.0/19 by InfoSphere - NTT PC Communications, Inc. in JP. c21a.jp 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
known-clean

Nutrition Label

WHISPER CANON · c21a.jpRouting diversity1.5/10Peering density3.8/10MOAS conflict✓ noneThreat-feed listings10.0/10WHOIS transparency6.7/10Resolver footprint3.2/10canon.whisper.security/host/c21a.jp

Resolution chain

IPv6 resolution

No AAAA record for c21a.jp is recorded in WhisperGraph.

Attribution

ntt

ORIGIN_AS

WHOIS identity

Registrant organisation
sr-c
Contact emails
support@xserver.ne.jp, t@takt.tk

Subdomains

Subdomain
mail.c21a.jp
www.c21a.jp

Showing 2 of 2 subdomains (2 per page).

Web-graph footprint

Sampled `LINKS_TO` edges. The hyperlink layer is a pilot sample, not a web-scale crawl, so these are illustrative.

Sample inbound links

Sample outbound links

Mail and authentication

Nameservers

  • ns1.value-domain.com
  • ns2.value-domain.com

MX records

  • sv7207.xserver.jp

SPF policy

  • a: c21a.jp
  • mx: c21a.jp
  • include: spf.sender.xserver.jp
  • a: sv7207.xserver.jp
  • include: c21.to

Threat-feed evidence

History

Related pages

Pivot from c21a.jp into the addresses, networks and registries it depends on.

Cypher and MCP

Reproduce this hostname's resolution chain against graph.whisper.security:

MATCH (h:HOSTNAME {name: "c21a.jp"})-[:RESOLVES_TO]->(ip:IPV4)
      -[:ANNOUNCED_BY]->(ap:ANNOUNCED_PREFIX)-[:ROUTES]->(a:ASN)
OPTIONAL MATCH (a)-[:HAS_NAME]->(n:ASN_NAME)
RETURN ip.name AS ip, ap.name AS prefix, a.name AS asn, n.name AS network
LIMIT 20

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