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81
Total
60
DNS
90
Email
84
Security
65
Network
100
Availability
Domainycombinator.com
IPv44
IPv60
MX records4
StatusActive
Domain technical report

Y Combinator

ycombinator.com

Y Combinator created a new model for funding early stage startups. Four times a year we invest in a large number of startups.

Generated: 2026-08-08T19:03:34-05:00 · Cached result

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IPv44
IPv60
MX4
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

4 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

!
DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

!
DNS propagation0 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

4 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

✓
DKIM20 / 20 pts · Mail

A DKIM selector was verified.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

152 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: server-3-168-51-29.ord58.r.cloudfront.net

✓
IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

4 record(s)
3.168.51.29
3.168.51.2
3.168.51.58
3.168.51.93

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

4 record(s)
10 aspmx.l.google.com.
20 alt1.aspmx.l.google.com.
30 aspmx4.googlemail.com.
20 alt2.aspmx.l.google.com.

TXT

13 record(s)
"MS=ms37374900"
"ca3-4861b957e83847c188e45d04ec314ee3"
"dropbox-domain-verification=asc63coma4mv"
"apple-domain-verification=WG0sP5Alm7N6h1Te"
"google-site-verification=GJKdQskycEclAGPua3yXB9m_nVhxbrsVps_y-t9SXV0"
"v=spf1 include:_spf.google.com include:mailgun.org a:rsweb1-36.investorflow.com include:_spf.createsend.com include:servers.mcsv.net -all"
"ZOOM_verify_2ndw8KZxSRa8PT8NmdyXvw"
"anthropic-domain-verification-0qe2ww=yK576oHdDgyTcXgkPfj1KXgGt"
"openai-domain-verification=dv-QbhxxK0G0JK0dnyZ4YTsNAfw"
"rippling-domain-verification=a660f7a4ab77a3de"
"google-site-verification=rivq8jKu6AADGtbbEzJhmOpcqq08B7QxIzXxYV8DtyU"
"google-site-verification=KsI69Y_jEVkp4eXqSQ9R9gwxjIpZznvuvrus6UolB9Y"
"Wayback verify for support request 741082"

NS

4 record(s)
ns-225.awsdns-28.com.
ns-556.awsdns-05.net.
ns-1914.awsdns-47.co.uk.
ns-1411.awsdns-48.org.

SOA

1 record(s)
ns-225.awsdns-28.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

0 record(s)
—

Not configured

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 include:_spf.google.com include:mailgun.org a:rsweb1-36.investorflow.com include:_spf.createsend.com include:servers.mcsv.net -all

DMARC

Configured
v=DMARC1; p=none; pct=100; sp=none; ruf=mailto:dmarc-reports+f@ycombinator.com; rua=mailto:dmarc-reports@ycombinator.com; aspf=r;

DKIM

Selector google
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnuaWvQpVOU3+XbFuUsiD3p8ncapXVxgQgxi8yUOjeeb7oNYZ1hfUSoLdTgMSBLOE0vycRCCMHZhE0iAusGSpirgRigowo97BPCpPNy1LHuwtFmBzZuYvZ1bIwKdj1WdemGrbZkhuoYZ0ddNpKfja6oE0ElDcklsRl3Unnwfxy2wIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
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.
Final URL
https://www.ycombinator.com/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://www.ycombinator.com/
Version
3
Server
cloudflare
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
ycombinator.com
Valid from
2025-12-10T18:00:00-06:00
Valid until
2027-01-08T17:59:59-06:00
Days remaining
152
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256

Security headers

5 active
✓
HSTSImplemented
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
✓
Referrer PolicyImplemented
—
Permissions PolicyNot detected
✓
Cross-Origin-Opener-PolicyImplemented
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Review
!
Differences detected

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
99.84.203.127, 99.84.203.24, 99.84.203.3, 99.84.203.60
105,15 ms
Cloudflare
1.1.1.1
3.168.51.2, 3.168.51.29, 3.168.51.58, 3.168.51.93
53,93 ms
Quad9
9.9.9.9
3.166.96.104, 3.166.96.129, 3.166.96.42, 3.166.96.63
120,91 ms
OpenDNS
208.67.222.222
99.84.203.127, 99.84.203.24, 99.84.203.3, 99.84.203.60
89,66 ms
AdGuard
94.140.14.14
3.166.96.104, 3.166.96.129, 3.166.96.42, 3.166.96.63
134,74 ms

IP, geolocation and ASNAssociated network information

3.168.51.29

No data
success
No
country
region
city
asn
organization
isp

3.168.51.2

No data
success
No
country
region
city
asn
organization
isp

3.168.51.58

No data
success
No
country
region
city
asn
organization
isp

3.168.51.93

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

aspmx.l.google.com

Port 25: Closed/unreachable - 0.7 ms - 
Port 465: Closed/unreachable - 4011.1 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

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