Hostname

def.ch

Last fetched Thu, 25 Jun 2026 12:23:55 GMT

def.ch resolves to 1 IPv4 address operated by AS29066 in US.

Nutrition Label

Resolution chain

def.ch 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
217.172.189.91	217.172.188.0/23	AS29066	—	US

WHOIS identity

Registrar: —
Organization: humey hunkeler & meyer
Contact emails: —

Subdomains

20 observed subdomains of def.ch.

Subdomain
host.def.ch
learning.def.ch
mail.def.ch
ns.def.ch
ns10.def.ch
ns2.def.ch
ns20.def.ch
shop.def.ch
shopupdate.def.ch
webmail.def.ch
www.def.ch

Showing 11 of 20. View all subdomains →

Web-graph footprint

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

1 site linked to from this hostname.

Sample outbound links

pagead2.googlesyndication.com

Threat posture

History

Mail and authentication

MX records

mail.def.ch

SPF policy

3 SPF mechanisms authorising senders for def.ch.

Mechanism	Target
SPF_A	def.ch
SPF_A	host.def.ch
SPF_MX	def.ch

Pivot deeper into the graph from def.ch.

Cypher and MCP

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

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