Usage Distribution in the Top 1 Million Sites

Distribution for websites using technologies

Technology	Websites	%
IPv6	359,958	36
Ubuntu	100,478	10.05
Envoy	54,434	5.44
OpenSSL	44,825	4.48
QUIC	31,886	3.19
Parallels Plesk Panel	31,391	3.14
Debian	27,019	2.7
CentOS	25,867	2.59
Unix	10,904	1.09
GitHub Hosting	7,717	0.77
mod_pagespeed	5,748	0.57
Red Hat Enterprise Linux	5,662	0.57
mod_ssl	3,359	0.34
mod_perl	3,028	0.3
AlmaLinux	2,279	0.23
FreeBSD	2,063	0.21
Apache Tomcat JK	2,007	0.2
Win32 Header	1,900	0.19
Fedora	1,373	0.14
Limiter Modules	1,187	0.12
Suhosin	629	0.06
Squid	445	0.04
Gentoo Linux	374	0.04
Alternate Protocol	158	0.02
GZIP Module	90	0.01
Hiawatha	83	0.01
Auth Passthrough	78	0.01
HHVM	48	0
Joyent JWS	20	0
Go Server	17	0
Cisco/Arrowpoint Content Service Switch	12	0
PowerPC	8	0
OpenGSE	1	0