Server Usage Distribution in the Top 1 Million Sites

Distribution for websites using Server technologies

Technology	Websites	%
IPv6	468,394	46.84
Ubuntu	81,679	8.17
Envoy	44,546	4.45
OpenSSL	38,464	3.85
QUIC	34,211	3.42
Parallels Plesk Panel	28,185	2.82
Debian	24,307	2.43
CentOS	19,537	1.95
GitHub Hosting	10,460	1.05
Unix	8,896	0.89
Red Hat Enterprise Linux	5,372	0.54
mod_pagespeed	5,126	0.51
AlmaLinux	3,163	0.32
mod_perl	2,697	0.27
mod_ssl	2,592	0.26
Apache Tomcat JK	1,804	0.18
FreeBSD	1,788	0.18
Win32 Header	1,560	0.16
Fedora	1,318	0.13
Limiter Modules	801	0.08
Suhosin	516	0.05
Squid	452	0.05
Gentoo Linux	343	0.03
Alternate Protocol	149	0.01
Hiawatha	63	0.01
GZIP Module	61	0.01
Auth Passthrough	48	0
HHVM	38	0
Go Server	26	0
PowerPC	19	0
Joyent JWS	15	0
Cisco/Arrowpoint Content Service Switch	12	0