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Total

DNS

Email

Security

100

Network

100

Availability

Domainzulip.com

IPv46

IPv66

MX records5

StatusActive

Domain technical report

Zulip — organized team chat

zulip.com

Zulip is an organized team chat app for distributed teams of all sizes.

Generated: 2026-08-12T08:39:12-05:00 · Cached result

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IPv46

IPv66

MX5

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

6 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

6 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).

✓

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

205 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: ec2-98-85-29-90.compute-1.amazonaws.com

✓

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

6 record(s)

98.85.29.90
98.95.244.83
107.21.148.168
34.198.85.174
52.7.187.7
107.22.210.127

AAAA

6 record(s)

2600:1f18:414:db16:8299:980f:c2c0:7c40
2600:1f18:414:db32:6d34:fa2f:19e0:e78c
2600:1f18:414:db64:dcaa:70da:e5b1:1207
2600:1f18:414:db00:67ba:dcd1:fcfc:9dd4
2600:1f18:414:db80:f503:33ee:360d:c86d
2600:1f18:414:db48:b337:f5f0:200f:f83b

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

5 alt2.aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
10 aspmx2.googlemail.com.
10 aspmx3.googlemail.com.

TXT

6 record(s)

"google-site-verification=PM2i77lQZbZ41LSxXD5v4y7g7CE0LFXdJdYy3ejfuow"
"abuseipdb-verification=zuewz0Gw"
"google-site-verification=3Es_BXEZ7HqL0XycxzjS9N4GQcC6k7dG4DPaxvl-WUQ"
"google-site-verification=9Jv0wj8luedHthbKsLItU6B2HpdPeynsMOD41km1VqY"
"v=spf1 include:_spf.google.com include:amazonses.com include:mailgun.org -all"
"MS=A39F8513BE669C8E81B8A81F4623ACA149454E87"

NS

4 record(s)

ns-1206.awsdns-22.org.
ns-1854.awsdns-39.co.uk.
ns-806.awsdns-36.net.
ns-427.awsdns-53.com.

SOA

1 record(s)

ns-806.awsdns-36.net. awsdns-hostmaster.amazon.com. 2021022301 7200 900 1209600 86400

CAA

2 record(s)

0 issue "letsencrypt.org"
0 issue "amazontrust.com"

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:_spf.google.com include:amazonses.com include:mailgun.org -all

DMARC

Configured

v=DMARC1; p=reject

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAljxFt/R4ttaj3ZIBDBQwKYs2z/KzbOuOXTGOW0dYNIjWnELq4Z9oE84G+RBhzkEIRMjabTJy9K/nhXhq2KGYlyCZRoNH1RldROXuhGszZX9jTpRD4XAuMBMAbSjgx0ujqQSifbKwlZy7U0iKjukX2y19NPovgG8MYSBI5BBCq39c79dP1+U4rx9IQeSkvLEoPuoGfoa5ZV7jVRnPtMb/H/sYa4s9JDirs1rdTXG+FA/Ilpvpdnn4uh4UjxF1vCErTefiJ7beb1Zg4dtSA9e83cvdqMlQRvSqWWyysZla1r6zLM5Ukxyr5kZplk9hWgrcp1pZkbH2n8/DVrZuPLtLxwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Zulip — organized team chat

Description

Zulip is an organized team chat app for distributed teams of all sizes.

Final URL

https://zulip.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://zulip.com/

Version

Server

nginx/1.24.0 (Ubuntu)

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

zulip.com

Valid from

2026-02-03T18:00:00-06:00

Valid until

2027-03-05T17:59:59-06:00

Days remaining

205

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

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

107.21.148.168, 107.22.210.127, 34.198.85.174, 52.7.187.7, 98.85.29.90, 98.95.244.83

100,61 ms

Cloudflare

1.1.1.1

107.21.148.168, 107.22.210.127, 34.198.85.174, 52.7.187.7, 98.85.29.90, 98.95.244.83

54,10 ms

Quad9

9.9.9.9

107.21.148.168, 107.22.210.127, 34.198.85.174, 52.7.187.7, 98.85.29.90, 98.95.244.83

78,15 ms

OpenDNS

Visitor

216.73.216.212

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

alt2.aspmx.l.google.com

Port 25: Closed/unreachable - 0.8 ms - 
Port 465: Closed/unreachable - 4015.3 ms - 
Port 587: Closed/unreachable - 4020 ms -

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