Analyze any domain

Get a complete DNS, email, SSL, HTTP and network analysis in seconds.

Total

DNS

Email

Security

Network

100

Availability

Domain37signals.com

IPv42

IPv60

MX records1

StatusActive

Domain technical report

37signals

37signals.com

A catalog of ideas — signals — that drive us.

Generated: 2026-08-09T17:50:18-05:00 · Cached result

JSON CSV PDF Visit site

IPv42

IPv60

MX1

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

2 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 policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 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

69 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers0 / 35 pts · Security

0 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓

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

2 record(s)

104.18.1.135
104.18.0.135

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 work-mx.app.hey.com.

TXT

11 record(s)

"v=spf1 include:_spf.basecamp.com include:servers.mcsv.net -all"
"stripe-verification=F970494BA4495175BB0BBBBBB611C2410B599753DB459B0B27676C72D5A688A6"
"8x2rys9qrtmrt08s01k2dhf220y0bc3h"
"anthropic-domain-verification-2ned89=7e1u02UWpXxRVFbqXvTepQODa"
"atlassian-domain-verification=jDcnbDUp4Eqr8vcG6rwzJC/AiL4ryyQCoTDiAKjKnP7rzlvnA4akV4QxvGnUaMS8"
"google-site-verification=75SnvFixCmuTIw1yttct06G6Mk7vGOqJDKqVd4sD66g"
"google-site-verification=vPyWJnzga2ciedbmL9z3PaMMS7gMZba_d4KE-GXzcUI"
"hey-verification:wvrWxEPH2vgJ5hJp8cjdWfZx"
"apple-domain-verification=fZq9u43pq901FVrX"
"openai-domain-verification=dv-brKIWqu5JEkAoXYjfCz66ucV"
"ZOOM_verify_3PsRA01tPEqbRQuZq0ovDX"

NS

2 record(s)

serena.ns.cloudflare.com.
merlin.ns.cloudflare.com.

SOA

1 record(s)

merlin.ns.cloudflare.com. dns.cloudflare.com. 2411395822 10000 2400 604800 60

CAA

13 record(s)

0 issue "digicert.com; cansignhttpexchanges=yes"
0 issue "amazon.com"
0 issuewild "ssl.com"
0 issuewild "letsencrypt.org"
0 issue "letsencrypt.org"
0 issuewild "comodoca.com"
0 issue "globalsign.com"
0 issue "ssl.com"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issue "comodoca.com"
0 iodef "mailto:sysadmins@37signals.com"
0 issuewild "digicert.com; cansignhttpexchanges=yes"

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.basecamp.com include:servers.mcsv.net -all

DMARC

Configured

v=DMARC1; p=quarantine; adkim=r; aspf=r; ri=3600; sp=none; fo=1;

DKIM

Selector k1

k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUoNyIR4Bn84LVcfZE20rmDeXQblIupNWBqLXM1Q+VieI/eZu/7k9/vOkLSaQQdml4Cv8lb3PcnluMVIhQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

37signals

Description

A catalog of ideas — signals — that drive us.

Final URL

https://37signals.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://37signals.com/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

37signals.com

Valid from

2026-07-20T04:50:02-05:00

Valid until

2026-10-18T05:49:39-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

0 active

—

HSTSNot detected

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

104.18.0.135, 104.18.1.135

53,04 ms

Cloudflare

1.1.1.1

104.18.0.135, 104.18.1.135

46,16 ms

Quad9

9.9.9.9

104.18.0.135, 104.18.1.135

102,78 ms

OpenDNS

208.67.222.222

104.18.0.135, 104.18.1.135

63,47 ms

AdGuard

94.140.14.14

104.18.0.135, 104.18.1.135

72,08 ms

IP, geolocation and ASNAssociated network information

104.18.1.135

Identified

success

Yes

country

United States

country_code

region

California

city

San Francisco

latitude

37.7749113

longitude

-122.4185412

asn

13335

organization

Cloudflare, Inc.

isp

Cloudflare, Inc.

timezone

America/Los_Angeles

104.18.0.135

Identified

success

Yes

country

United States

country_code

region

California

city

San Francisco

latitude

37.7749113

longitude

-122.4185412

asn

13335

organization

Cloudflare, Inc.

isp

Cloudflare, Inc.

timezone

America/Los_Angeles

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

work-mx.app.hey.com

Port 25: Closed/unreachable - 13.1 ms - 
Port 465: Closed/unreachable - 17.1 ms - 
Port 587: Closed/unreachable - 12.3 ms -

Recently analyzed domains

View all →

asso.fr4 enamad.ir42 businessfrance.fr96 qc.ca4 go.id15 mn.us4 dovecot.org97 saramin.co.kr62 fl.us4 gsa.gov95