Server Usage Distribution in the Top 1 Million Sites

Distribution for websites using Server technologies

Technology	Websites	%
IPv6	464,036	46.4
Ubuntu	80,366	8.04
Envoy	43,599	4.36
OpenSSL	37,927	3.79
QUIC	33,305	3.33
Parallels Plesk Panel	27,896	2.79
Debian	23,961	2.4
CentOS	19,314	1.93
GitHub Hosting	10,332	1.03
Unix	8,765	0.88
Red Hat Enterprise Linux	5,293	0.53
mod_pagespeed	5,049	0.5
AlmaLinux	3,069	0.31
mod_perl	2,649	0.26
mod_ssl	2,559	0.26
Apache Tomcat JK	1,778	0.18
FreeBSD	1,764	0.18
Win32 Header	1,526	0.15
Fedora	1,296	0.13
Limiter Modules	795	0.08
Suhosin	501	0.05
Squid	443	0.04
Gentoo Linux	338	0.03
Alternate Protocol	148	0.01
GZIP Module	61	0.01
Hiawatha	61	0.01
Auth Passthrough	48	0
HHVM	38	0
Go Server	24	0
PowerPC	19	0
Joyent JWS	12	0
Cisco/Arrowpoint Content Service Switch	11	0