Port 9993ZeroTier

ZeroTier One uses UDP port 9993 for encrypted virtual-network traffic and peer connectivity.

transport: udp
in transit: encrypted
assignment: unofficial
risk: 4/10
lookups: 0

Technical Details

what runs on :9993

ZeroTier carries its virtual-network protocol over UDP, using port 9993 by default. It uses peer-to-peer connectivity and NAT traversal where possible; the traffic is encrypted as part of the ZeroTier protocol. This is a ZeroTier convention, not an IANA service assignment, and TCP or SCTP is not the normal transport for this port.

Security Information

exposure of :9993

risk score

4/ 10caution

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

security averages 3.1 across 373 ports — this one sits 0.9 above.

in transit

encrypted

payloads are protected on the wire

assignment

unofficial

used by convention, not registered — what answers here varies by deployment

reachable over

udp

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

security overview

UDP 9993 is normally expected to be reachable for ZeroTier connectivity, but exposure can make a host discoverable and subject it to probing or denial-of-service attempts. Overlay access is intended to be restricted by network membership and authorization; allow the port only where ZeroTier is deployed and apply the product's access controls.

Record

iana registry entry

port: :9993
service: ZeroTier
transport: UDP
encryption: tls / encrypted
assignment: convention only
risk: 4/10caution
category: Security Network Services
usage: ZeroTier One commonly uses UDP 9993 for traffic between nodes and its infrastructure when establishing and maintaining virtual networks. Engineers may see it on endpoint and server firewalls where ZeroTier connectivity is allowed.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: ZeroTier Documentation

Something wrong?

This record is maintained by the engineers who use port 9993. 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 2026-10-05.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 373 in security →

the 8 most looked-up other ports in security — 373 ports carry that label.

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:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Squid Proxy HTTP	TCP	Web Services	caution	45.8k
:8080	HTTP Alternate	TCP	Web Services	caution	44.9k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k

risk mix of the 8 listed

caution100%

2 of 8 encrypted

Port :9993ZeroTier

Technical Details

Security Information

Related Ports

Port 9993ZeroTier