Hostname

youfirst.co

Last fetched Tue, 14 Jul 2026 08:22:09 GMT

youfirst.co resolves to 1 IPv4 address operated by MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation in FR. WHOIS lists iana:1251 as the registrar.

Nutrition Label

Resolution chain

youfirst.co 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
52.143.148.21	52.136.0.0/13	AS8075	MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation	FR

WHOIS identity

Registrar: iana:1251
Organization: gecina
Contact emails: —

Subdomains

17 observed subdomains of youfirst.co.

Subdomain
admin.youfirst.co
bureau.youfirst.co
business.youfirst.co
campus.youfirst.co
collaborative.youfirst.co
jim.youfirst.co
login-okta.youfirst.co
login-test.youfirst.co
login.youfirst.co
residence.youfirst.co
residentiel.youfirst.co
vdp.youfirst.co

Showing 12 of 17. View all subdomains →

Web-graph footprint

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

7 sites link to this hostname.

Sample inbound links

Threat posture

History

Mail and authentication

MX records

SPF policy

9 SPF mechanisms authorising senders for youfirst.co.

Mechanism	Target
SPF_INCLUDE	servers.mcsv.net
SPF_INCLUDE	spf.protection.outlook.com
SPF_IP	149.11.115.184
SPF_IP	194.2.122.190/32
SPF_IP	195.25.67.22/32
SPF_IP	34.248.8.165/32
SPF_IP	52.18.156.134/32
SPF_IP	92.103.226.85/32
SPF_MX	youfirst.co

Pivot deeper into the graph from youfirst.co.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "youfirst.co"})-[: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.