|# List of hosters of Matrix servers by infosec-handbook.eu. The Matrix servers are from https://www.hello-matrix.net/public_servers.php|
|# Checked on 2019-7-12|
|Liberty Global B.V. hosts 1 Matrix server: ['junta.pl']|
|Online S.a.s. hosts 2 Matrix servers: ['converser.eu', 'tedomum.net']|
|Leaseweb Asia Pacific pte. ltd. hosts 1 Matrix server: ['perthchat.org']|
|OVH SAS hosts 2 Matrix servers: ['alternanet.fr', 'chat.privacytools.io']|
|Hetzner Online GmbH hosts 4 Matrix servers: ['matrix.allmende.io', 'matrix.sibnsk.net', 'feneas.org', 'ru-matrix.org']|
|Netwerkvereniging Coloclue hosts 1 Matrix server: ['chat.weho.st']|
|Amazon.com, Inc. hosts 1 Matrix server: ['hackerspaces.be']|
|Cloudflare, Inc. hosts 1 Matrix server: ['matrix.org']|
|Contabo GmbH hosts 1 Matrix server: ['tchncs.de']|
|This list is from infosec-handbook.eu.|
I think something like https://matrix.org/_matrix/client/r0/directory/room/%23matrix%3Amatrix.org would be a better place to collect list of Matrix servers. It's servers that #matrix:matrix.org is hosted on and probably easily the majority.
Have you thought about doing something similar for secure DNS servers (DNSCrypt/DNS-over-TLS/DNS-over-HTTPS)?
We will check this.
At the moment, we only did this for XMPP, Matrix and Mastodon. Maybe, we will add information about other servers. However, as already pointed out by the Mastodon main developer, it is very likely that we always get the same results: The majority of servers are hosted by big server hosting companies.