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Rank #3,470Updated November 10, 2026

a16z.com

Andreessen Horowitz | Software Is Eating the World

a16z.com is registered with MarkMonitor Inc. since January 26, 2009 (17.8 years). The registration expires on January 13, 2028. The site runs on Alpine.js, WordPress, Google Analytics 4 and 11 other technologies. Its email security grade is C. Its SSL certificate is issued by Amazon and is valid for 152 more days.

Domain age
17.8 yrs
Technologies
14
Email security
C
SSL days left
152

Registration

RegistrarMarkMonitor Inc.
IANA ID292
RegisteredJanuary 26, 2009
ExpiresJanuary 13, 2028
UpdatedDecember 12, 2025
Statusclient delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Name serversha1.markmonitor.zone, ha2.markmonitor.zone, ha3.markmonitor.zone, ha4.markmonitor.zone
DNSSECNot signed

DNS records

TypeValueTTL
A3.173.22.177156
A3.173.23.177156
A3.173.21.177156
MXaspmx.l.google.com 1086400
MXalt1.aspmx.l.google.com 2086400
MXalt2.aspmx.l.google.com 3086400
MXaspmx2.googlemail.com 4086400
MXaspmx3.googlemail.com 5086400
NSha2.markmonitor.zone86400
NSha4.markmonitor.zone86400
NSha1.markmonitor.zone86400
NSha3.markmonitor.zone86400
CAAissue 0 amazon.com86400
CAAissue 0 digicert.com86400
CAAissue 0 godaddy.com86400
CAAissue 0 letsencrypt.org86400
CAAissue 0 pki.goog86400
TXTMS=ms781214883600
TXTa5ml0q2qredqkscjd0cnd3rs5o3600
TXTTAILSCALE-hgqvPubwp5HFczvxm0V33600
TXT_vrqgxie1mta8uhyy76vp839ltffv75i3600
TXTZOOM_verify_CZpP8WiXT3CuvCsqJO99fQ3600
TXTlinear-domain-verification=ka59g9ke4vnh3600
TXTMS=297F6982EA6FC1794C4BC3FB5FF63A8E4CD4FAC43600
TXTccisso=ccd758c0-2760-47f8-a10d-e5fc116fddae3600
TXTaffinity-allowed-subdomains=a16z,a16z-crypto3600
TXTverification_token=ZafKHBCylvBuswNOZN9YpFEc13600
TXTjamf-site-verification=r5S6YMFCZk83AroC1PcG8w3600
TXT1password-site-verification=YNM3U5T3JZG5PEII74IIUKCOLQ3600

Technology stack

Analytics
Google Analytics 4Parse.lyPlausible
CDN
Amazon CloudFront
CMS
WordPress
Fonts
Adobe Fonts
Hosting
Amazon S3
JavaScript framework
Alpine.js
Marketing automation
Marketo
Programming language
PHP
Security
Content Security PolicyHSTS
SEO
Yoast SEO
Tag manager
Google Tag Manager

Analytics and advertising IDs

google_analytics:G-TDNC6XM13Mgoogle_tag_manager:GTM-WHMSDPX

SSL certificate

ValidValid
IssuerUS, Amazon RSA 2048 M04, Amazon
ExpiresApril 11, 2027
Days remaining152
ProtocolTLSv1.3
Namesa16z.com, www.a16z.com, pre-prod.a16z.com

Email security

CScore 76/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
  • warnSPF uses 10 of the 10 allowed DNS lookups. Adding another service may break it.
  • warnDKIM key found (selector: google) but it is only 1024 bits; 2048 is recommended.
  • 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 rejected (hard fail).
  • goodDMARC policy is quarantine: failing mail goes to spam. Move to p=reject for full protection.
  • goodDMARC aggregate reports are sent to mailto:[email protected].
  • good5 MX record(s) found. Mail is handled by Google Workspace.

Homepage metadata

TitleAndreessen Horowitz | Software Is Eating the World
DescriptionAndreessen Horowitz (a16z) is a venture capital firm in Silicon Valley, California, investing in bold founders, innovators, and entrepreneurs building the future through technology.
Languageen
Canonicalhttps://a16z.com/
Structured dataWebPage, ImageObject, BreadcrumbList, WebSite, Organization
IndexableYes
Word count131

About a16z.com

Who is the registrar of a16z.com?

a16z.com is registered with MarkMonitor Inc. (IANA ID 292).

When does a16z.com expire?

The current registration of a16z.com expires on January 13, 2028. It was first registered on January 26, 2009.

What technology does a16z.com use?

We detected 14 technologies on a16z.com, including Google Analytics 4, Parse.ly, Plausible, Amazon CloudFront, WordPress, Adobe Fonts.

Does a16z.com protect its email with SPF and DMARC?

a16z.com scores 76/100 (grade C) for email security. SPF uses 10 of the 10 allowed DNS lookups. Adding another service may break it. DKIM key found (selector: google) but it is only 1024 bits; 2048 is recommended.

What are the name servers of a16z.com?

a16z.com uses ha2.markmonitor.zone, ha4.markmonitor.zone, ha1.markmonitor.zone, ha3.markmonitor.zone.