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73
Total
85
DNS
20
Email
73
Security
100
Network
100
Availability
Domaingo.dev
IPv44
IPv64
MX records5
StatusActive
Domain technical report

The Go Programming Language

go.dev

Go is an open source programming language that makes it simple to build secure, scalable systems.

Generated: 2026-08-08T19:38:56-05:00 · Cached result

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IPv44
IPv64
MX5
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

4 IPv4 address(es) detected.

✓
IPv6 (AAAA)10 / 10 pts · Dns

4 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 policy5 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

5 MX record(s).

!
SPF0 / 25 pts · Mail

SPF policy not found.

!
DMARC0 / 25 pts · Mail

DMARC policy not found.

!
DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

76 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: any-in-2215.1e100.net

✓
IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓
IPv6 connectivity35 / 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)
216.239.34.21
216.239.32.21
216.239.38.21
216.239.36.21

AAAA

4 record(s)
2001:4860:4802:36::15
2001:4860:4802:32::15
2001:4860:4802:34::15
2001:4860:4802:38::15

CNAME

0 record(s)
—

Not configured

MX

5 record(s)
10 alt4.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
1 aspmx.l.google.com.

TXT

5 record(s)
"google-site-verification=mJdpiJi2GyNG9nz7sctCXgJnzDHzdFzfhOqTTDuMR0s"
"google-site-verification=qvibgBDBD_1VeFXvgduqw1cmDeMpAS_qBCZCFauYduk"
"google-site-verification=eqtrduRyMRS8TuoUEuYMF-u9_IDRMd1In6T6E1gTchU"
"google-site-verification=3oHHTSOKrjE9J8SIvyj3gUxEtDjmr5oNZ-DbB271vpM"
"google-site-verification=eYE-BIP9BY8VZCUI_r8sJi7qjRVtxyRQSlbZmeVVlzE"

NS

4 record(s)
ns-cloud-e4.googledomains.com.
ns-cloud-e3.googledomains.com.
ns-cloud-e2.googledomains.com.
ns-cloud-e1.googledomains.com.

SOA

1 record(s)
ns-cloud-e1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300

CAA

2 record(s)
0 issue "letsencrypt.org"
0 issue "pki.goog"

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

Not configured
—

Not configured

DMARC

Not configured
—

Not configured

DKIM

Not found
—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
The Go Programming Language
Description
Go is an open source programming language that makes it simple to build secure, scalable systems.
Final URL
https://go.dev/
HTTP status
200

HTTP

Status
HTTP/2 200
Final URL
https://go.dev/
Version
3
Server
Google Frontend
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Google Trust Services
CN
go.dev
Valid from
2026-07-26T15:16:42-05:00
Valid until
2026-10-24T16:03:51-05:00
Days remaining
76
Protocol
TLSv1.3
Cipher
TLS_AES_256_GCM_SHA384

Security headers

2 active
✓
HSTSImplemented
✓
Content Security PolicyImplemented
—
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
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
51,26 ms
Cloudflare
1.1.1.1
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
43,69 ms
Quad9
9.9.9.9
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
75,49 ms
OpenDNS
208.67.222.222
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
175,35 ms
AdGuard
94.140.14.14
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
122,08 ms

IP, geolocation and ASNAssociated network information

216.239.34.21

No data
success
No
country
region
city
asn
organization
isp

216.239.32.21

No data
success
No
country
region
city
asn
organization
isp

216.239.38.21

No data
success
No
country
region
city
asn
organization
isp

216.239.36.21

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

alt4.aspmx.l.google.com

Port 25: Closed/unreachable - 0.8 ms - 
Port 465: Closed/unreachable - 4020.5 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

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