12 of the 18 CustomMobs Minecraft servers listed here are running 1.21, which is most of the category. 7 of them also run Survival and 6 SMP, so expect the two to come together here.

ServerAboutJoin
Last vote 12m ago
Players online: 102
Germany 1.21.11-26.3 Points this month: 503 · 503 votes4.8 out of 5 · 20 reviews
4.8 out of 5 · 20 reviews

Mvndicraft is a medieval soft RP geopolitical server with a custom combat system

Last vote 37m ago
Players online: 10
Netherlands 1.7.2-26.3 Points this month: 49 · 49 votes5.0 out of 5 · 3 reviews
5.0 out of 5 · 3 reviews

Roleplay, Earth SMP and more!

WORLD OF PIXEL [MAIN 1.21.4-8]
🌎Planet Pixel + 🏠Reallife!
Last vote 39m ago
Players online: 24
United States 1.8-1.21.9 Points this month: 78 · 78 votes4.8 out of 5 · 11 reviews
4.8 out of 5 · 11 reviews

Welcome to TikBlock — survival with a custom twist!

Last vote 9h ago
Players online: 3
Netherlands 1.13-26.3 Points this month: 12 · 18 votes4.9 out of 5 · 2 reviews
4.9 out of 5 · 2 reviews

Xironite Survival SMP [26.2] Xironite is a feature-packed Survival SMP focused…

┅┅┅┅┅┅┅┅┅┅┅┅ Xironite ┅┅┅┅┅┅┅┅┅┅┅┅
● Join our friendly community ●
Last vote 1d ago
Players online: 1
United States 1.16-1.21.9 Points this month: 5 · 5 votes5.0 out of 5 · 1 review
5.0 out of 5 · 1 review

Farcross is the ultimate Minecraft Java and Bedrock SMP you've been missing out on!

6
Players online: 0
Canada 1.21.11 5.0 out of 5 · 1 review

Factions SMP where you can form alliances, raid, and survive on 1.21.11

Timeforged is a Minecraft server that brings a unique RPG experience to players.

Timeforged [1.21.9+]
The Era Update (Version 1.3)

MAVEN'S HIVE is a Minecraft server focused on adventure, PvP, and survival.

ᴍᴀᴠᴇɴ'ѕ ʜɪᴠᴇ » ѕᴇᴀѕᴏɴ 8
♜ ᴅᴜɴɢᴇᴏɴѕ | ☠ ᴄᴜѕᴛᴏᴍ ᴍᴏʙѕ | ✦ ꜰʀɪᴅᴀʏ ᴇᴠᴇɴᴛѕ

GospelCraft is a Minecraft server that combines gaming with scripture.

GospelCraft - Introducing scripture through gaming
|
☀Towny☀|🗡McMMO🏹|⛏Jobs₪|✞Custom Mobs✞|

Welcome to TimelordS, a Minecraft server focused on RPG elements and custom mobs.

Timeforged [1.21.9+]
The Era Update (Version 1.3)

This server features a custom survival experience that includes unique cosmetics…

BRYXEL REALM
Custom Semi-RPG | Dungeons / Collections
Server down for updates! check discord for info!

WoopGaming Factions is a Minecraft server focused on Factions gameplay.

WOOPMC >> Coming Soon ????? [1.21+]
₪ ᴄᴜsᴛᴏᴍ ᴍᴏʙs, ɪᴛᴇᴍs, ᴅᴜɴɢᴇᴏɴs, ᴀɴᴅ ᴍᴏʀᴇ!

Hopsipop is a Minecraft server that offers a unique survival experience.

HOPSIPOP • Survival Reimagined
Technology
• Fishing • Small Playerbase • PvE

Here, players can engage in quests, earn achievements, and collect badges.

BROCODE
SEASON 1 - THE RISE OF CHAOS

MVNDICRAFT leads them this month on 503 votes, which is what puts it at the top rather than anything it paid.

7,083 servers listed 483,983 players online 201,535 speak English

Know a great server that's not listed yet? Suggest it – takes 10 seconds, no account needed.

Questions

Do these servers all run 1.21?

Every listing on this page reports 1.21 as its version. Many accept a span of client versions as well – each listing shows its own minimum and maximum where the owner filled them in, so check before you update.

How many CustomMobs 1.21 Minecraft servers are listed?

12 right now. A combination only gets its own page here once at least 3 servers match it, which is why there is a page for this one and not for every pairing – the rest of the CustomMobs listings are on the CustomMobs page, and the rest of the 1.21 ones on the 1.21 page.

How do I join a server in Minecraft?

Copy the address from the server's listing. Java Edition: 1. Open Minecraft – Launch Minecraft: Java Edition and go to the Multiplayer menu. 2. Add the server – Click "Add Server" and paste the address into the server address field. 3. Join – Click "Done", then double-click the server to join. Bedrock Edition: 1. Open Minecraft – Launch Minecraft (Bedrock Edition) and go to the Servers tab. 2. Add the server – Scroll down, tap "Add Server", then paste the address and port. 3. Join – Save, then tap the server to join. Bedrock and Eaglercraft entries show their own address where they differ.

Do I need to own Minecraft to join these servers?

Most need a paid (premium) Minecraft account. Some run in offline mode, often called cracked, so any username can connect without buying the game – use the Cracked filter to find them.

How does voting for Minecraft servers work?

Voting pushes a server up this month's ranking and usually pays you a reward in-game – most listings show exactly what you get. You can vote once every 24 hours per server.

How is the ranking calculated?

Servers are ordered by votes received in the current calendar month, which resets on the 1st. Sponsor slots and premium plans buy visibility, never rank – they apply no boost of any kind, and every listing is ranked by votes alone.

Are these CustomMobs 1.21 servers free to play on?

Yes – every server listed here is free to join. Some sell optional cosmetic or convenience perks on their own store; look for the tags and reviews on each listing.