Port 51820WireGuard

WireGuard VPN tunnels commonly listen for encrypted traffic on UDP port 51820.

transport: udp
in transit: encrypted
assignment: official
risk: 3/10
lookups: 0

Technical Details

what runs on :51820

WireGuard runs over UDP and uses a Noise_IK-based cryptographic handshake to authenticate peers and establish session keys. Encapsulated IP packets are carried in encrypted UDP datagrams using modern primitives including Curve25519, ChaCha20-Poly1305, and BLAKE2s. Port 51820 is a default convention rather than a protocol requirement, and WireGuard does not use a corresponding TCP port.

Security Information

exposure of :51820

risk score

3/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

security averages 3.2 across 324 ports — this one sits 0.2 below.

in transit

encrypted

payloads are protected on the wire

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

WireGuard is designed to be exposed on the internet when it serves as a VPN endpoint, and traffic is encrypted and authenticated by configured public keys. Exposure still permits probing and denial-of-service attempts, and a compromised private key or misconfigured peer can provide VPN access; restrict allowed IPs and administrative access around the endpoint.

Record

iana registry entry

port: :51820
service: WireGuard
transport: UDP
encryption: tls / encrypted
assignment: iana registered
risk: 3/10caution
category: Security Remote Access
usage: WireGuard uses UDP port 51820 as its conventional default listening port for VPN peers. Engineers commonly encounter it on VPN gateways, routers, firewalls, and servers running WireGuard; deployments may configure a different port.
lookups: 0rank 994
added: 2026-09-16
updated: 2026-09-16
references: IANA Service Name and Transport Protocol Port Number Registry
WireGuard Protocol
WireGuard Quick Start

Something wrong?

This record is maintained by the engineers who use port 51820. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-16.

01edit any field on a page of its own
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edit this record →back to the registry

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all 324 in security →

the 8 most looked-up other ports in security — 324 ports carry that label.

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risk mix of the 8 listed

caution100%

3 of 8 encrypted

Port :51820WireGuard

Technical Details

Security Information

Related Ports

Port 51820WireGuard