Is port 3544 (Teredo Tunneling) dangerous?

Port 3544 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 3544 be open on my firewall?

Port 3544 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 3544 use?

Port 3544 (Teredo Tunneling) uses the UDP transport protocol and falls under the System & Infrastructure category.

:3544 (UDP)

Teredo Tunneling

Medium Risk

UDP — System & Infrastructure

Port Overview

Port Number 3544

Service Name Teredo Tunneling

Transport Protocol UDP

Category System & Infrastructure

Security Risk Medium

Port Range Registered (1024-49151)

What is Port 3544?

Port 3544 is used by Teredo, a Microsoft tunneling protocol that provides IPv6 connectivity to hosts that are behind IPv4 NAT devices. Teredo encapsulates IPv6 packets within IPv4 UDP datagrams to traverse NAT boundaries. It was commonly used during the IPv4-to-IPv6 transition period.

UDP System & Infrastructure

Security Considerations

Port 3544 (Teredo Tunneling) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.

Recommendation: Keep the service updated. Monitor logs for unusual activity.

Related Ports — System & Infrastructure

0 Reserved 1 TCPMUX 2 Management Utility 3 CompressNET 4 Unassigned 5 RJE 6 Unassigned 7 Echo

Related Terms

Bandwidth Latency Packet Loss Ping Throughput ASN