How is ycombinator.com?

Looks fine risk 0/100

Registered 22 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 253 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

253 ms · ends at www.ycombinator.com

HTTPS

185 d

left on a Amazon certificate

Age

22 years

registered 2005-03-20

Blocklists

listings across 5 lists

Everything we looked at

DNS records5 record types

A	108.138.64.8 108.138.64.45 108.138.64.111 108.138.64.90
AAAA	2600:9000:2508:7200:15:891f:4040:93a1 2600:9000:2508:c200:15:891f:4040:93a1 2600:9000:2508:ce00:15:891f:4040:93a1 2600:9000:2508:5a00:15:891f:4040:93a1 2600:9000:2508:2400:15:891f:4040:93a1 2600:9000:2508:de00:15:891f:4040:93a1 2600:9000:2508:8000:15:891f:4040:93a1 2600:9000:2508:ee00:15:891f:4040:93a1
MX	20 alt1.aspmx.l.google.com 10 aspmx.l.google.com 20 alt2.aspmx.l.google.com 30 aspmx4.googlemail.com
NS	ns-225.awsdns-28.com ns-1914.awsdns-47.co.uk ns-1411.awsdns-48.org ns-556.awsdns-05.net
TXT	apple-domain-verification=WG0sP5Alm7N6h1Te v=spf1 include:_spf.google.com include:mailgun.org a:rsweb1-36.investorflow.com include:_spf.createsend.com include:servers.mcsv.net -all Wayback verify for support request 741082 rippling-domain-verification=a660f7a4ab77a3de google-site-verification=rivq8jKu6AADGtbbEzJhmOpcqq08B7QxIzXxYV8DtyU ZOOM_verify_2ndw8KZxSRa8PT8NmdyXvw MS=ms37374900 google-site-verification=GJKdQskycEclAGPua3yXB9m_nVhxbrsVps_y-t9SXV0 openai-domain-verification=dv-QbhxxK0G0JK0dnyZ4YTsNAfw anthropic-domain-verification-0qe2ww=yK576oHdDgyTcXgkPfj1KXgGt google-site-verification=KsI69Y_jEVkp4eXqSQ9R9gwxjIpZznvuvrus6UolB9Y ca3-4861b957e83847c188e45d04ec314ee3 dropbox-domain-verification=asc63coma4mv

RegistrationGandi SAS

registrar	Gandi SAS
registered	2005-03-20
expires	2027-03-20
last changed	2026-02-13
owner	Y Combinator
nameservers	ns-1411.awsdns-48.org ns-1914.awsdns-47.co.uk ns-225.awsdns-28.com ns-556.awsdns-05.net
status	client transfer prohibited

registered 2005-03-20expires 2027-03-20

HTTPS certificate185 days left

valid	yes
issuer	Amazon
covers	ycombinator.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
protocol	TLSv1.3

issued 2026-10-21expires 2027-05-06

DNSSECinsecure

Domain is not signed with DNSSEC

. → com → ycombinator.com

Email authenticationgood

SPF	pass `v=spf1 include:_spf.google.com include:mailgun.org a:rsweb1-36.investorflow.com include:_spf.createsend.com include:servers.mcsv.net -all`
DMARC	warning policy none
DKIM	found: google, k1, s1, s2

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 163/205

Basic Security

20/40missing: DNSSEC Enabled

Record Security

23/45missing: CAA Records, DMARC Record, DKIM Presence

Advanced Security

25/25

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 14 lookups

SURBL MultidomainURIBL MultidomainSpamCop108.138.64.90Barracuda108.138.64.90UCEPROTECT Level 1108.138.64.90SpamCop108.138.64.45Barracuda108.138.64.45UCEPROTECT Level 1108.138.64.45SpamCop108.138.64.111Barracuda108.138.64.111UCEPROTECT Level 1108.138.64.111SpamCop108.138.64.8Barracuda108.138.64.8UCEPROTECT Level 1108.138.64.8

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=ycombinator.com" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=ycombinator.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on ycombinator.com. Reference: /llms.txt.

IPv6. Does ycombinator.com work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch ycombinator.com. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days