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Gridlode
Rank #621Updated November 10, 2026

ycombinator.com

Y Combinator

ycombinator.com is registered with Gandi SAS since March 21, 2005 (21.6 years). The registration expires on March 21, 2027. The site runs on Ruby on Rails, PostHog, Universal Analytics and 7 other technologies. Its email security grade is C. Its SSL certificate is issued by Amazon and is valid for 178 more days.

Domain age
21.6 yrs
Technologies
10
Email security
C
SSL days left
178

Registration

RegistrarGandi SAS
IANA ID81
RegisteredMarch 21, 2005
ExpiresMarch 21, 2027
UpdatedFebruary 14, 2026
Statusclient transfer prohibited
Name serversns-1411.awsdns-48.org, ns-1914.awsdns-47.co.uk, ns-225.awsdns-28.com, ns-556.awsdns-05.net
DNSSECNot signed

DNS records

TypeValueTTL
A18.66.112.5060
A18.66.112.12060
A18.66.112.4060
A18.66.112.11760
MXaspmx.l.google.com 10300
MXalt1.aspmx.l.google.com 20300
MXalt2.aspmx.l.google.com 20300
MXaspmx4.googlemail.com 30300
NSns-1411.awsdns-48.org172800
NSns-1914.awsdns-47.co.uk172800
NSns-225.awsdns-28.com172800
NSns-556.awsdns-05.net172800
TXTMS=ms37374900300
TXTWayback verify for support request 741082300
TXTZOOM_verify_2ndw8KZxSRa8PT8NmdyXvw300
TXTanthropic-domain-verification-0qe2ww=yK576oHdDgyTcXgkPfj1KXgGt300
TXTapple-domain-verification=WG0sP5Alm7N6h1Te300
TXTca3-4861b957e83847c188e45d04ec314ee3300
TXTdropbox-domain-verification=asc63coma4mv300
TXTgoogle-site-verification=GJKdQskycEclAGPua3yXB9m_nVhxbrsVps_y-t9SXV0300
TXTgoogle-site-verification=KsI69Y_jEVkp4eXqSQ9R9gwxjIpZznvuvrus6UolB9Y300
TXTgoogle-site-verification=rivq8jKu6AADGtbbEzJhmOpcqq08B7QxIzXxYV8DtyU300
TXTopenai-domain-verification=dv-QbhxxK0G0JK0dnyZ4YTsNAfw300
TXTrippling-domain-verification=a660f7a4ab77a3de300
AAAA2600:9000:223f:b400:15:891f:4040:93a160
AAAA2600:9000:223f:c600:15:891f:4040:93a160
AAAA2600:9000:223f:6c00:15:891f:4040:93a160
AAAA2600:9000:223f:3200:15:891f:4040:93a160
AAAA2600:9000:223f:1e00:15:891f:4040:93a160
AAAA2600:9000:223f:8000:15:891f:4040:93a160
AAAA2600:9000:223f:6600:15:891f:4040:93a160
AAAA2600:9000:223f:5c00:15:891f:4040:93a160

Technology stack

Analytics
PostHogUniversal Analytics
CDN
Cloudflare
Fonts
Google Fonts
Maps
Google Maps
Programming language
Ruby
Search
Algolia
Security
Content Security PolicyHSTS
Web framework
Ruby on Rails

Analytics and advertising IDs

google_analytics:UA-51714649-1

SSL certificate

ValidValid
IssuerUS, Amazon RSA 2048 M01, Amazon
ExpiresMay 7, 2027
Days remaining178
ProtocolTLSv1.3
Namesycombinator.com, yankeecharlie.com, ycswag.com, www.yclabs.org, yclabs.org, www.femalefoundergifts.com, ycgiftguide.com, www.ycswag.com, yc.fyi, www.ycinside.net, ycomb.net, yankeecharlie.net

Email security

CScore 65/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
  • warnSPF uses 9 of the 10 allowed DNS lookups. Adding another service may break it.
  • warnDMARC policy is none (monitoring only). Spoofed mail is still delivered.
  • warnNo MTA-STS: mail sent to you can be downgraded to an unencrypted connection.
  • warnNo TLS-RPT record, so you won't hear about failed encrypted deliveries.
  • warnNo BIMI record (optional: shows your logo next to your emails in supporting inboxes).
  • goodSPF record found.
  • goodSPF ends with -all: servers you have not listed are rejected (hard fail).
  • goodDMARC aggregate reports are sent to mailto:[email protected], mailto:[email protected], mailto:[email protected].
  • goodDKIM keys found (selector: google, k1, s1, s2).
  • good4 MX record(s) found. Mail is handled by Google Workspace.

Homepage metadata

TitleY Combinator
DescriptionY Combinator created a new model for funding early stage startups. Four times a year we invest in a large number of startups.
Languageen
IndexableYes
Word count1816

About ycombinator.com

Who is the registrar of ycombinator.com?

ycombinator.com is registered with Gandi SAS (IANA ID 81).

When does ycombinator.com expire?

The current registration of ycombinator.com expires on March 21, 2027. It was first registered on March 21, 2005.

What technology does ycombinator.com use?

We detected 10 technologies on ycombinator.com, including PostHog, Universal Analytics, Cloudflare, Google Fonts, Google Maps, Ruby.

Does ycombinator.com protect its email with SPF and DMARC?

ycombinator.com scores 65/100 (grade C) for email security. SPF uses 9 of the 10 allowed DNS lookups. Adding another service may break it. DMARC policy is none (monitoring only). Spoofed mail is still delivered.

What are the name servers of ycombinator.com?

ycombinator.com uses ns-1411.awsdns-48.org, ns-1914.awsdns-47.co.uk, ns-225.awsdns-28.com, ns-556.awsdns-05.net.