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netcode.io

Free#23 of 29 in Game Networking Middleware

netcode.io: A focused UDP protocol for secure, tokenized dedicated-server connections. Ranked #23 of 29 in Game Networking Middleware by our editors (6.7/10); pricing: Open source; best for engine teams needing secure low-level UDP connections.

6.7/10Editor score

Visit netcode.io

netcode.io6.7 Visit netcode.io

At a glance

Editor score
6.7 / 10
Pricing
Open source
Best for
Engine teams needing secure low-level UDP connections
Paid from
Free
Matchmaking
No
Facts checked
21 Sep 2026

Where it wins
- Connect tokens support secure client/server authorization
- Protects packets against replay, malicious-packet, and amplification attacks
- Supports C, C#, Go, Rust, Unity, UE4, and TypeScript
Where it doesn't
- Matchmaking remains an application responsibility
- Backend authentication remains outside the protocol
- Focused on low-level UDP transport rather than broader middleware

Our verdict on netcode.io

netcode.io is an open-source client/server networking protocol for multiplayer games. It is designed for game clients connecting to dedicated servers over UDP, with connection establishment, connect-token authorization, encrypted and signed packet exchange, client slot allocation, and capacity enforcement. Engine and language coverage includes C, C#, Go, Rust, Unity, Unreal Engine 4, and TypeScript, making it suited to teams that want a focused networking layer across several development environments.

Its strongest area is connection security and transport control. Connect tokens provide the authorization mechanism, while encrypted and signed packets help protect exchanges. The protocol also includes replay, malicious-packet, and amplification-attack protection, plus IPv4 and IPv6 support. Packet tagging and unreliable unordered UDP transport are included for applications that need low-level control. Clean disconnect handling and hard-disconnect timeouts add defined behavior around connection termination, while slot allocation and capacity enforcement help dedicated servers manage client admission.

netcode.io keeps its scope narrow. Matchmaking and backend authentication remain application responsibilities, so teams choosing it need to provide those surrounding services themselves. The project is open source under the BSD 3-Clause license and is self-hosted, with no paid tier structure described. Choose it when secure tokenized connections, dedicated-server networking, and UDP control are the priority. Teams seeking built-in matchmaking or a broader game-services middleware layer should look for a product that covers those responsibilities directly.

Your product? Our editors can test netcode.io in depth and publish a review, labelled as paid · from $149/mo →

netcode.io pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on github.com

netcode.io fact sheet

Free plan	Not verified
Paid from	Free
Network model	Client-server
Supported platforms	C, C#, Go, Rust, Unity, UE4, TypeScript
Matchmaking	No
Rollback netcode	Not verified
Max players per session	Not verified
Transport protocols	UDP
Deployment	Self-hosted
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Open source
Website	github.com
Facts checked	21 Sep 2026

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Featured on iTechGuides

netcode.io is listed in our Game Networking Middleware directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update