Should port 8333 be open on my firewall?

Port 8333 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 8333 use?

Port 8333 (Bitcoin P2P) uses the TCP transport protocol and falls under the Other category.

:8333 (TCP)

Bitcoin P2P

Q: Is port 8333 (Bitcoin P2P) dangerous?

Port 8333 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Low Risk

TCP — Other

Port Overview

Port Number 8333

Service Name Bitcoin P2P

Transport Protocol TCP

Category Other

Security Risk Low

Port Range Registered (1024-49151)

What is Port 8333?

Port 8333 is the standard peer-to-peer communication port for the Bitcoin network, used by Bitcoin full nodes to connect to other nodes and synchronize the blockchain. Nodes accepting incoming connections on this port contribute to the health and decentralization of the Bitcoin network. Running a Bitcoin full node on this port helps support the network's resilience.

TCP Other Commonly Used

Security Considerations

Port 8333 (Bitcoin P2P) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.

Recommendation: Standard security practices apply. Keep software updated and monitor access.

Related Ports — Other

35 Private Printer Server 43 WHOIS 63 Whois++ 75 Private Dial-Out Service 78 VetTCP 91 MIT-DOV 92 NPP 104 DICOM

Related Terms

ASN BGP Hijack Data Center Domain Name Dual Stack Internet Exchange Point (IXP)