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Gridlode
Rank #1,032Updated November 10, 2026

zlib.net

zlib Home Site

zlib.net is registered with GoDaddy.com, LLC since March 17, 2002 (24.7 years). The registration expires on March 16, 2029. The site runs on HSTS, Apache HTTP Server. Its email security grade is F. Its SSL certificate is issued by Let's Encrypt and is valid for 35 more days.

Domain age
24.7 yrs
Technologies
2
Email security
F
SSL days left
35

Registration

RegistrarGoDaddy.com, LLC
IANA ID146
RegisteredMarch 17, 2002
ExpiresMarch 16, 2029
UpdatedFebruary 15, 2024
Statusclient delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Name serversns1.a2hosting.com, ns2.a2hosting.com, ns3.a2hosting.com, ns4.a2hosting.com
DNSSECNot signed

DNS records

TypeValueTTL
A85.187.148.2153
MXzlib.net 0480
NSns4.a2hosting.com86400
NSns3.a2hosting.com86400
NSns1.a2hosting.com86400
NSns2.a2hosting.com86400
TXTv=spf1 +mx +a +ip4:68.66.224.49 ~all14400

Technology stack

Security

SSL certificate

ValidValid
IssuerUS, YR2, Let's Encrypt
ExpiresDecember 15, 2026
Days remaining35
ProtocolTLSv1.3
Names*.adler.me, *.gzip.org, *.madler.net, *.zlib.net, adler.me, gzip.org, www.adler.madler.net, www.gzip.madler.net, www.zlib.madler.net, zlib.net

Email security

FScore 43/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
  • badNo DMARC record. Receivers have no instructions for mail that fails SPF and DKIM, and you get no reports about who sends as your domain.
  • 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).
  • goodDKIM keys found (selector: default).
  • good1 MX record(s) found.

Homepage metadata

Titlezlib Home Site
IndexableYes
Word count2647

About zlib.net

Who is the registrar of zlib.net?

zlib.net is registered with GoDaddy.com, LLC (IANA ID 146).

When does zlib.net expire?

The current registration of zlib.net expires on March 16, 2029. It was first registered on March 17, 2002.

What technology does zlib.net use?

We detected 2 technologies on zlib.net, including HSTS, Apache HTTP Server.

Does zlib.net protect its email with SPF and DMARC?

zlib.net scores 43/100 (grade F) for email security. No DMARC record. Receivers have no instructions for mail that fails SPF and DKIM, and you get no reports about who sends as your domain. No MTA-STS: mail sent to you can be downgraded to an unencrypted connection.

What are the name servers of zlib.net?

zlib.net uses ns4.a2hosting.com, ns3.a2hosting.com, ns1.a2hosting.com, ns2.a2hosting.com.