Every server reports which Minecraft versions it accepts. Many Java servers use ViaVersion, so you can join with an older or newer game version too. A server is listed under every version it supports.
26.xVersions of 202667 σέρβερ · 66 online1.21Tricky Trials2024 · 68 σέρβερ · 67 online1.20Trails & Tales2023 · 65 σέρβερ · 64 online1.19The Wild Update2022 · 61 σέρβερ · 60 online1.18Caves & Cliffs Part II2021 · 61 σέρβερ · 60 online1.17Caves & Cliffs Part I2021 · 61 σέρβερ · 60 online1.16Nether Update2020 · 62 σέρβερ · 61 online1.15Buzzy Bees2019 · 61 σέρβερ · 60 online1.14Village & Pillage2019 · 61 σέρβερ · 60 online1.13Update Aquatic2018 · 61 σέρβερ · 60 online1.12World of Color2017 · 61 σέρβερ · 60 online1.11Exploration Update2016 · 61 σέρβερ · 60 online1.10Frostburn Update2016 · 61 σέρβερ · 60 online1.9Combat Update2016 · 61 σέρβερ · 60 online1.8Bountiful Update2014 · 60 σέρβερ · 59 online1.7The Update that Changed the World2013 · 48 σέρβερ · 47 online
Bedrock Edition
Bedrock Edition (phone, console, Windows) always runs the current release, so the versions above apply to Java Edition.
Which version to choose
Play the newest version if you can, most servers accept it. PvP players still choose 1.8.9 for the old combat without attack cooldown, and modded servers often run 1.7.10, 1.12.2 or 1.20.1.