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Total

100

DNS

Email

Security

100

Network

100

Availability

Domainhackmd.io

IPv42

IPv63

MX records5

StatusActive

Domain technical report

HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing

hackmd.io

HackMD gives you a real-time Markdown editor for collaborative work. Working with Markdown files in HackMD is simple, straightforward, and fun.

Generated: 2026-08-09T02:52:13-05:00 · Cached result

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IPv42

IPv63

MX5

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

3 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 chain15 / 15 pts · Dns

DS and DNSKEY detected.

✓

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

177 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: a865a9e11bc2c0d65.awsglobalaccelerator.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

2 record(s)

75.2.77.152
99.83.179.177

AAAA

3 record(s)

2406:da14:88d:a100:509b:269a:a86a:469
2406:da14:88d:a101:6a1e:666e:6b0b:2229
2406:da14:88d:a102:65d7:74a6:1e55:5003

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

5 alt1.aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.

TXT

11 record(s)

"apple-domain-verification=HnlQ3AxJK6XOBK37"
"bw=8qGCJqfuH16sCug6AQzGtfUnzPCoeYlw2CtDDqrVUlQE"
"v=spf1 include:amazonses.com include:zoho.com include:servers.mcsv.net include:mail.zendesk.com include:mailgun.org include:_spf.google.com ~all"
"1password-site-verification=57QCQRGM55BBXPSVY7HZ2PLKJ4"
"google-site-verification=Yr_Bo_yeVoZeSEPkuJe4pugd0xb7gNecEcm0VauL3Xc"
"MS=ms17207355"
"linkedin-site-verification=5d31432e-bc68-4ef3-9cee-139129f957b4"
"google-site-verification=d-uL-RwYIwGp2juReXK632sSBTtVCCKWghWmt2fC05s"
"anthropic-domain-verification-ekxc7r=4lWNrSKPr2Z7oG6fkxggmBiED"
"cursor-domain-verification-2jk9c4=aMLb6LeKrCxC5zZDxaO6YViu0"
"google-site-verification=4C6HQbZYXANAOkpGxSjVMQ5Y2rnkxnDKI5foWeuv5tU"

NS

4 record(s)

ns-221.awsdns-27.com.
ns-1444.awsdns-52.org.
ns-845.awsdns-41.net.
ns-1925.awsdns-48.co.uk.

SOA

1 record(s)

ns-221.awsdns-27.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

6 record(s)

0 iodef "mailto:support@hackmd.io"
0 issuewild "awstrust.com"
0 issuewild "amazontrust.com"
0 issuewild "letsencrypt.org"
0 issuewild "amazon.com"
0 issuewild "amazonaws.com"

DS

1 record(s)

54360 13 2 CF91241F9513C3AE8E559A21F9D4A553F5F48E4E30F5219231DEAE0C 72C76D02

DNSKEY

3 record(s)

256 3 13 tQlto1YXF3+Upfq18j24Y+GlGOIB43qUNM5oizB2L0g2wAri8ug50I7q LKigFn02dSScAkkojfnTkgsZt0LMXw==
256 3 13 qL+Dg/zfNYTwyuMw7hJHgHmUVUl7+cOvcBboJmkpqYDRpRe6tN8XHIS5 vIou38Sf8k/leoIhd9pVeLQBfBE1uw==
257 3 13 hgcd7jVVnkL9kiizf6/yBqHeoCy+0+R1rGvXJRLLhX+mMvYaMOC/BoHS hOzHlRugiEbDaNlY+syEKR+eCrx7DQ==

RRSIG

5 record(s)

NS 13 2 172800 20260811085201 20260809065201 23774 hackmd.io. lLWN9fxoWoCz6Xqxb8xITP1G3qMI5eJAqLT7DpLG0WhAbZbnbp73kpMt blcx2I6XUyF59cTUVcjUZ1rkw++6JQ==
AAAA 13 2 60 20260809085301 20260809065201 23774 hackmd.io. gq+y2tTW3BcsZxMGUCqwA/sBReTDS28GsK0QfFkzSITC2ufCNWZRPW3z R7kVlWDRP1P62hNrTOiXEI39w8RkBA==
A 13 2 300 20260809085701 20260809065201 23774 hackmd.io. MKldLQndR20Lz/HKmybERZgy59NDlNHfw8r1kD96+BpDuE/9FLTbJUMr 4O7df0wNz3BrJ/3za1Dd1R1U0GL2+Q==
DS 8 2 3600 20260822160612 20260801150612 46863 io. bUa2xGbiCl44c9bmldLiZae9SKGzFqGC0eSpAATVsqjsNV+tljHgHh2Q hHRfANCs7VgI8y4PIreLVr+WRkvlXiJ4V4arDpIDJnoY17dkB22qEVj9 Aa6HqGaRdgUYEQUi6CPooNAtmgNoJSebc7fMbnuJRKzgjNxWa4LK44ct 7K8=
CAA 13 2 300 20260809085701 20260809065201 23774 hackmd.io. mAes/txLDwUmkip+94dSH2ayNnK/NsatZmk1hRnrcd8bS4+czebJ3AZs 7vlQJRc7qRTngXJJ+2qR8DIU2YrctQ==

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:amazonses.com include:zoho.com include:servers.mcsv.net include:mail.zendesk.com include:mailgun.org include:_spf.google.com ~all

DMARC

Configured

v=DMARC1;p=reject;pct=100;rua=mailto:dmarc@hackmd.io

DKIM

Selector google

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbKpihRQQaeHBbn2vVOHFx67bZ/QrnI6Dx/VlSFawSSJcDuHa+4RLgPEeiZXlc14fNe6Pd/siqoCevGJ2CI5/Av/FCMJqm/IMRMUFm9J52ghDYxbaeUagfUUGGRISUr/tD+e4eHF3pDomDxDN6zxPznQaAqIdgTTvu2KB5sxuiaQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing

Description

HackMD gives you a real-time Markdown editor for collaborative work. Working with Markdown files in HackMD is simple, straightforward, and fun.

Final URL

https://hackmd.io/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://hackmd.io/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Amazon

hackmd.io

Valid from

2026-01-04T18:00:00-06:00

Valid until

2027-02-02T17:59:59-06:00

Days remaining

177

Protocol

TLSv1.2

Cipher

ECDHE-RSA-AES128-GCM-SHA256

Security headers

4 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

—

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

75.2.77.152, 99.83.179.177

61,21 ms

Cloudflare

1.1.1.1

75.2.77.152, 99.83.179.177

45,95 ms

Quad9

9.9.9.9

75.2.77.152, 99.83.179.177

63,60 ms

OpenDNS

208.67.222.222

75.2.77.152, 99.83.179.177

86,01 ms

AdGuard

94.140.14.14

75.2.77.152, 99.83.179.177

83,70 ms

IP, geolocation and ASNAssociated network information

75.2.77.152

No data

success

country

region

city

asn

organization

isp

99.83.179.177

No data

success

country

region

city

asn

organization

isp

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

alt1.aspmx.l.google.com

Port 25: Closed/unreachable - 0.7 ms - 
Port 465: Closed/unreachable - 4020.1 ms - 
Port 587: Closed/unreachable - 4020 ms -

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