c21.to on Whisper Internet Directory

Nutrition Label

Resolution chain

c21.to resolves to 3 distinct IPv4 addresses via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.

IP	Prefix	ASN	Operator	Country
117.102.216.132	117.102.192.0/19	AS2514	—	JP
117.102.216.133	117.102.192.0/19	AS2514	—	JP
61.206.121.85	61.206.112.0/20	AS2514	—	JP

WHOIS identity

No WHOIS records are currently associated with c21.to in WhisperGraph.

Subdomains

17 observed subdomains of c21.to.

Subdomain
chintai.c21.to
heart21.c21.to
image.c21.to
info.c21.to
mail.c21.to
ns1.c21.to
ns2.c21.to
server.c21.to
server07.c21.to
server11.c21.to
server15.c21.to
server2.c21.to
server4.c21.to
server8.c21.to
tk0.c21.to
wildcard.c21.to
www.c21.to

Web-graph footprint

Distinct hostnames that link to or from c21.to in the public web crawl.

221 sites link to this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

SPF policy

8 SPF mechanisms authorising senders for c21.to.

Mechanism	Target
SPF_INCLUDE	mxr.valueserver.jp
SPF_IP	117.102.216.132
SPF_IP	117.102.216.133
SPF_IP	157.7.107.27
SPF_IP	202.172.24.0/21
SPF_IP	203.141.157.18
SPF_IP	219.117.255.132
SPF_IP	61.206.121.85

Related pages

Pivot deeper into the graph from c21.to.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "c21.to"})-[: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.