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Gridlode
Rank #3,815Updated November 10, 2026

hackmd.io

HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing

The site runs on Next.js, React, Node.js and 2 other technologies. Its email security grade is B. Its SSL certificate is issued by Amazon and is valid for 85 more days.

Domain age
—
Technologies
5
Email security
B
SSL days left
85

DNS records

TypeValueTTL
A75.2.77.152300
A99.83.179.177300
MXaspmx.l.google.com 160
MXalt1.aspmx.l.google.com 560
MXalt2.aspmx.l.google.com 560
MXalt3.aspmx.l.google.com 1060
MXalt4.aspmx.l.google.com 1060
NSns-221.awsdns-27.com172800
NSns-845.awsdns-41.net172800
NSns-1444.awsdns-52.org172800
NSns-1925.awsdns-48.co.uk172800
CAAiodef 0 mailto:[email protected]300
CAAissuewild 0 amazon.com300
CAAissuewild 0 amazonaws.com300
CAAissuewild 0 amazontrust.com300
CAAissuewild 0 awstrust.com300
CAAissuewild 0 letsencrypt.org300
TXTMS=ms17207355300
TXTapple-domain-verification=HnlQ3AxJK6XOBK37300
TXTbw=8qGCJqfuH16sCug6AQzGtfUnzPCoeYlw2CtDDqrVUlQE300
TXT1password-site-verification=57QCQRGM55BBXPSVY7HZ2PLKJ4300
TXTcursor-domain-verification-2jk9c4=aMLb6LeKrCxC5zZDxaO6YViu0300
TXTanthropic-domain-verification-ekxc7r=4lWNrSKPr2Z7oG6fkxggmBiED300
TXTlinkedin-site-verification=5d31432e-bc68-4ef3-9cee-139129f957b4300
TXTsecureframe-domain-verification-mzam4a=UoIGUnLIgTaUjghh14cplbzQM300
TXTgoogle-site-verification=4C6HQbZYXANAOkpGxSjVMQ5Y2rnkxnDKI5foWeuv5tU300
TXTgoogle-site-verification=Yr_Bo_yeVoZeSEPkuJe4pugd0xb7gNecEcm0VauL3Xc300
TXTgoogle-site-verification=d-uL-RwYIwGp2juReXK632sSBTtVCCKWghWmt2fC05s300
TXTv=spf1 include:_spf.google.com include:amazonses.com include:mail.zendesk.com include:mailgun.org ~all300
AAAA2406:da14:88d:a100:6400:d86a:12e6:ca2e60
AAAA2406:da14:88d:a101:b2ac:951d:7ae0:4ab660
AAAA2406:da14:88d:a102:f07d:71fa:3be2:c0a560

Technology stack

JavaScript framework
Next.jsReact
Programming language
Node.js
Security
HSTS
Tag manager
Google Tag Manager

Analytics and advertising IDs

google_tag_manager:GTM-KLW9Z3

SSL certificate

ValidValid
IssuerUS, Amazon RSA 2048 M04, Amazon
ExpiresFebruary 3, 2027
Days remaining85
ProtocolTLSv1.2
Nameshackmd.io, *.hackmd.io

Email security

BScore 83/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
  • warnSPF uses 8 of the 10 allowed DNS lookups. Adding another service may break it.
  • warnNo MTA-STS: mail sent to you can be downgraded to an unencrypted connection.
  • warnNo TLS-RPT record, so you won't hear about failed encrypted deliveries.
  • warnNo BIMI record (optional: shows your logo next to your emails in supporting inboxes).
  • goodSPF record found.
  • goodSPF ends with ~all: servers you have not listed are marked as suspicious (soft fail).
  • goodDMARC policy is reject: mail that fails authentication is blocked.
  • goodDMARC aggregate reports are sent to mailto:[email protected].
  • goodDKIM keys found (selector: google, s1, s2).
  • good5 MX record(s) found. Mail is handled by Google Workspace.

Homepage metadata

TitleHackMD: Your Collaborative Markdown Workspace for Knowledge Sharing
DescriptionHackMD gives you a real-time Markdown editor for collaborative work. Working with Markdown files in HackMD is simple, straightforward, and fun.
Languageen
Canonicalhttps://hackmd.io
Structured dataOrganization
IndexableYes
Word count2244

About hackmd.io

What technology does hackmd.io use?

We detected 5 technologies on hackmd.io, including Next.js, React, Node.js, HSTS, Google Tag Manager.

Does hackmd.io protect its email with SPF and DMARC?

hackmd.io scores 83/100 (grade B) for email security. SPF uses 8 of the 10 allowed DNS lookups. Adding another service may break it. No MTA-STS: mail sent to you can be downgraded to an unencrypted connection.

What are the name servers of hackmd.io?

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