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Hostname

f4s.com

Last fetched

f4s.com resolves to 4 IPv4 addresses operated by AMAZON-02 - Amazon.com, Inc. in AU. WHOIS lists iana:468 as the registrar.

Nutrition Label

WHISPER CANON · f4s.comRouting diversity3.0/10Peering density9.5/10MOAS conflict✓ noneThreat-feed listings10.0/10WHOIS transparency10.0/10Resolver footprint8.3/10canon.whisper.security/host/f4s.com

Resolution chain

f4s.com resolves to 4 distinct IPv4 addresses via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.

IPPrefixASNOperatorCountry
13.237.37.813.236.0.0/14AS16509AMAZON-02 - Amazon.com, Inc.AU
13.237.4.3813.236.0.0/14AS16509AMAZON-02 - Amazon.com, Inc.AU
3.106.144.883.104.0.0/14AS16509AMAZON-02 - Amazon.com, Inc.AU
54.153.192.22454.153.128.0/17AS16509AMAZON-02 - Amazon.com, Inc.AU

WHOIS identity

Registrar
iana:468
Organization
on behalf of f4s.com owner
Contact emails

Subdomains

8 observed subdomains of f4s.com.

Subdomain
amplitude-api.f4s.com
app.f4s.com
cdn.f4s.com
mx.f4s.com
segment-cdn.f4s.com
sl.f4s.com
staging.f4s.com
www.f4s.com

Web-graph footprint

Distinct hostnames that link to or from f4s.com in the public web crawl.

1 site linked to from this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

SPF policy

5 SPF mechanisms authorising senders for f4s.com.

MechanismTarget
SPF_INCLUDE_spf.google.com
SPF_INCLUDE_spf.salesforce.com
SPF_INCLUDEemsd1.com
SPF_INCLUDEmx.f4s.com
SPF_INCLUDEsendgrid.net

Related pages

Pivot deeper into the graph from f4s.com.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "f4s.com"})-[: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.