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382.3 M

Registered domains

9.2 M

New domains in the last 30 days

65.0 M

Social media profiles detected

ycombinator.com

ycombinator.com serves a website of its own over HTTPS and under www. It answers on both IPv4 and IPv6, with a valid TLS certificate and MX records for mail.

2,523 other domains share an IP address with it, and 341 domains redirect to it.

The most recent crawl returned the page title “Y Combinator” and 329,975 bytes of HTML. The site links to Instagram, Facebook, Twitter and YouTube profiles.

Domain properties

Property Value Explanation
First seen unknown Date the domain was first seen.
Has website yes A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record yes The domain has an MX record.
External redirect no The domain redirects to another domain.
Redirect to https yes The domain redirects to https.
Redirect to www. yes The domain redirects to www.domain.
Only with www. no The domain can only be reached with the subdomain "www".
Only DNS, no website no There are no A or AAAA records in DNS.
IP-Address Both Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate valid Shows whether the domain has a valid SSL certificate.
Redirects 341 Number of domains that redirect to this domain.
Reverse IP 2,523 Number of domains with the same IP(s).

Detected social media networks

Last successful crawl

Title Y Combinator
Description Y Combinator created a new model for funding early stage startups. Four times a year we invest in a large number of startups.
Content-Length 329,975 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

Last SSL certificate

Issuer Amazon
Valid from 9/30/2026
Valid to 4/16/2027
Time until expiry 194 days

DNS history

IPv4 address Last updated
18.66.112.117 3/9/2026
18.66.112.120 3/9/2026
18.66.112.40 3/9/2026
18.66.112.50 3/9/2026
52.222.236.125 3/2/2026
IPv6 address Last updated
2600:9000:223f:1600:15:891f:4040:93a1 9/29/2026
2600:9000:223f:2200:15:891f:4040:93a1 9/29/2026
2600:9000:223f:600:15:891f:4040:93a1 9/29/2026
2600:9000:223f:7000:15:891f:4040:93a1 9/29/2026
2600:9000:223f:ae00:15:891f:4040:93a1 9/29/2026
Mail server Priority Last updated
aspmx.l.google.com 10 1/5/2024
alt1.aspmx.l.google.com 20 1/5/2024
alt2.aspmx.l.google.com 20 1/5/2024
aspmx4.googlemail.com 30 1/5/2024
Name server Last updated
ns-1411.awsdns-48.org 12/9/2023
ns-1914.awsdns-47.co.uk 12/9/2023
ns-225.awsdns-28.com 12/9/2023
ns-556.awsdns-05.net 12/9/2023

Last 5 redirect domains

Domain Last seen
orangereddit.com 10/3/2026
yco.mba 10/3/2026
yankeecharlie.org 10/3/2026
yankeecharlie.net 10/2/2026
ycombinatornews.com 10/2/2026
cofoundermatching.org 10/2/2026
femalefoundergifts.com 10/2/2026
ycombinatorstartupnews.com 10/2/2026
bookf.ac 10/2/2026
givescrutiny.ai 10/2/2026
theycombinator.com 10/2/2026
aiswdev.com 10/2/2026

Reverse IP neighbours

2600:9000:223f:a800:15:891f:4040:93a1 2 domains · here since 10/2/2026
Domain On this IP since
ycomb.com 10/1/2026
2600:9000:223f:ae00:15:891f:4040:93a1 2 domains · here since 10/2/2026
Domain On this IP since
ycomb.com 10/1/2026
2600:9000:223f:ea00:15:891f:4040:93a1 2 domains · here since 10/2/2026
Domain On this IP since
ycstartups.com 10/2/2026
2600:9000:223f:f800:15:891f:4040:93a1 2 domains · here since 10/2/2026
Domain On this IP since
ycombinator.net 9/26/2026
2600:9000:223f:4c00:15:891f:4040:93a1 1 domain · here since 10/2/2026
Domain On this IP since
No other domains on this address.
2600:9000:223f:7200:15:891f:4040:93a1 1 domain · here since 10/2/2026
Domain On this IP since
No other domains on this address.
2600:9000:223f:8800:15:891f:4040:93a1 1 domain · here since 10/2/2026
Domain On this IP since
No other domains on this address.
2600:9000:223f:b600:15:891f:4040:93a1 1 domain · here since 10/2/2026
Domain On this IP since
No other domains on this address.
18.66.112.117 674 domains · here since 9/20/2026
Domain On this IP since
zmqapi.xyz 9/17/2026
yummygoode.com 10/2/2026
yorozuyafukuchan.com 9/13/2026
ycstartups.com 10/2/2026
ycombinator.net 9/26/2026
ycomb.com 10/1/2026
yc120.org 10/1/2026
yarr.bet 9/20/2026
yarahradio.com 9/17/2026
yankeecharlie.org 10/3/2026
yankeecharlie.net 10/2/2026
xydle.com 9/18/2026
and 661 more
18.66.112.50 640 domains · here since 9/20/2026
Domain On this IP since
zzzz004.com 9/18/2026
zyldop.com 9/17/2026
zonescorts.one 9/17/2026
zlzbet.cc 9/13/2026
ziyadatravels.com 9/14/2026
zithara.ai 9/17/2026
zencoder.com 9/14/2026
yxxbet.vip 9/15/2026
yxestorage.com 9/19/2026
yourshomeservice.com 9/19/2026
yosaparkgakuen.com 9/19/2026
ycstartups.com 10/2/2026
and 627 more

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses.