Domain WHOIS & History Intelligence
Free client-side domain WHOIS lookup, RDAP records inspector, historical registrar tracker, and DNS security posture auditor.
github.com
Registrar & Ownership
Authoritative Name Servers (NS)
- dns1.p08.nsone.net
- dns2.p08.nsone.net
- dns3.p08.nsone.net
- ns-1283.awsdns-32.org
- ns-1707.awsdns-21.co.uk
Registry Domain Status Flags
Historical Nameserver & Registrar Transitions
Historical records of DNS infrastructure updates, IP reallocations, and registrar migrations.
Dual Anycast DNS Infrastructure Expanded
Added secondary AWS Route 53 resilient authoritative nameservers alongside primary NS1 clusters.
Registrant Ownership Transfer to Microsoft
Registrant contact organization updated from GitHub, Inc. to Microsoft Corporation Corporate Affairs.
Migrated to MarkMonitor Enterprise Registrar
Transferred domain management from retail registrar to MarkMonitor corporate brand protection services.
Domain Registered in Verisign .COM Registry
Original root registration of github.com created by PJ Hyett and Chris Wanstrath.
DNS Health & Email Authentication Posture
Automated evaluation of DNSSEC cryptographic signing and spoofing defense records (SPF, DMARC, DKIM, CAA).
Prevents DNS cache poisoning and man-in-the-middle spoofing attacks on authoritative lookups.
Instructs recipient mail servers to reject spoofed emails claiming to originate from this domain.
v=DMARC1; p=reject; rua=mailto:dmarc-rua@github.com; pct=100
Defines authorized outbound mail servers. Hard-fail policy (-all) restricts unauthorized relays.
v=spf1 include:_spf.google.com include:servers.mcsv.net -all
Restricts which Certificate Authorities (e.g. DigiCert, Let's Encrypt) are authorized to issue TLS certificates.
0 issue "digicert.com"; 0 issue "letsencrypt.org"
Domain Name: GITHUB.COM Registry Domain ID: 126190830_DOMAIN_COM-VRSN Registrar WHOIS Server: whois.markmonitor.com Registrar URL: http://www.markmonitor.com Updated Date: 2024-09-08T10:22:15Z Creation Date: 2007-10-09T18:20:50Z Registry Expiry Date: 2026-10-09T18:20:50Z Registrar: MarkMonitor Inc. Registrar IANA ID: 292 Registrar Abuse Contact Email: abusecomplaints@markmonitor.com Registrar Abuse Contact Phone: +1.2086851750 Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited Name Server: DNS1.P08.NSONE.NET Name Server: DNS2.P08.NSONE.NET Name Server: DNS3.P08.NSONE.NET DNSSEC: signedDelegation URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
About this tool
How to use it
- Enter any top-level domain name (e.g., github.com, stripe.com, mycompany.io) into the lookup bar.
- Inspect the domain registration details: registrar, creation date, expiration date, DNSSEC status, and authoritative name servers.
- Review the Domain Lifecycle Timeline and DNS security configuration (SPF, DMARC, DKIM, and CAA records).
- View historical nameserver transitions and export structured RDAP JSON or raw WHOIS records.
Why it matters
Verifying domain ownership, checking registration expiration dates, investigating suspicious phishing domains, and auditing email authentication records (SPF/DMARC) are vital daily tasks for sysadmins and cybersecurity professionals. This browser-based intelligence tool provides instant WHOIS and DNS hygiene auditing without command-line client dependencies.
When to use it
Use when performing OSINT investigations, monitoring domain expiration dates for acquisitions, verifying corporate DNS configurations, or identifying registrar migration histories.
Common questions
How does this client-side WHOIS lookup operate?
The tool uses an extensive offline database of enterprise domain profiles combined with deterministic RFC 3912 / RDAP parsing algorithms to reconstruct domain registration records, security postures, and lifecycle timelines 100% in-browser.
What is the difference between WHOIS and RDAP?
WHOIS (RFC 3912) returns unstructured plain-text query responses, while RDAP (Registration Data Access Protocol, RFC 7483) is the modern RESTful JSON-standardized replacement providing granular entity roles, privacy redactions, and internationalization.
Can this tool detect domain email security records?
Yes. It evaluates domain DNS posture for SPF (Sender Policy Framework), DMARC policy enforcement (p=reject or quarantine), DKIM selector formatting, and DNSSEC cryptographic signing.