Server Usage Distribution in the Top 1 Million Sites

Distribution for websites using Server technologies

Technology	Websites	%
IPv6	505,466	50.55
Ubuntu	92,409	9.24
Envoy	44,441	4.44
OpenSSL	41,897	4.19
QUIC	34,806	3.48
Parallels Plesk Panel	30,958	3.1
Debian	27,985	2.8
CentOS	22,042	2.2
GitHub Hosting	10,754	1.08
Unix	10,538	1.05
Red Hat Enterprise Linux	5,830	0.58
mod_pagespeed	5,288	0.53
AlmaLinux	3,199	0.32
mod_perl	2,972	0.3
mod_ssl	2,960	0.3
FreeBSD	1,992	0.2
Apache Tomcat JK	1,989	0.2
Win32 Header	1,836	0.18
Fedora	1,453	0.15
Limiter Modules	952	0.1
Suhosin	571	0.06
Squid	468	0.05
Gentoo Linux	381	0.04
Alternate Protocol	161	0.02
GZIP Module	70	0.01
Hiawatha	70	0.01
Auth Passthrough	54	0.01
HHVM	48	0
Go Server	25	0
Joyent JWS	21	0
PowerPC	14	0
Cisco/Arrowpoint Content Service Switch	14	0
OpenGSE	1	0