Some of them could be Modpack servers. There are only certain versions with support for most mods (1.12.2, 1.7.10, sometimes 1.10). Many of the more established

Some of them could be Modpack servers. There are only certain versions with support for most mods (1.12.2, 1.7.10, sometimes 1.10). Many of the more established modpacks still run on 1.7.10 or even older