Hostname

def.rs

Last fetched Sat, 18 Jul 2026 11:03:18 GMT

def.rs resolves to 2 IPv4 addresses operated by COGNETCLOUD-2 - cognetcloud INC in HK.

Nutrition Label

Resolution chain

def.rs resolves to 2 distinct IPv4 addresses via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.

IP	Prefix	ASN	Operator	Country
165.99.42.101	165.99.42.0/24	AS401701	COGNETCLOUD-2 - cognetcloud INC	HK
217.217.28.24	217.217.28.0/24	AS203380	—	DE

WHOIS identity

No WHOIS records are currently associated with def.rs in WhisperGraph.

Subdomains

3 observed subdomains of def.rs.

Subdomain
b.def.rs
ctf.def.rs
note.def.rs

Threat posture

History

Mail and authentication

MX records

SPF policy

1 SPF mechanism authorising senders for def.rs.

Mechanism	Target
SPF_INCLUDE	spf.163.com

Pivot deeper into the graph from def.rs.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "def.rs"})-[: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.