Is port 8545 (Ethereum JSON-RPC) dangerous?

Port 8545 is classified as critical risk and should not be exposed to the public internet. It transmits data without encryption, making it vulnerable to eavesdropping and credential theft.

Should port 8545 be open on my firewall?

No, port 8545 should not be open to the public internet. Block it at the firewall and use encrypted alternatives such as SSH, SFTP, or HTTPS instead.

What transport protocol does port 8545 use?

Port 8545 (Ethereum JSON-RPC) uses the TCP transport protocol and falls under the Other category.

:8545 (TCP)

Ethereum JSON-RPC

Critical Risk

TCP — Other

Port Overview

Port Number 8545

Service Name Ethereum JSON-RPC

Transport Protocol TCP

Category Other

Security Risk Critical

Port Range Registered (1024-49151)

What is Port 8545?

Port 8545 is the default JSON-RPC port for Ethereum nodes (go-ethereum/geth and others) for interacting with the Ethereum blockchain. DApps, wallets, and Web3 developers use this port to query blockchain state and submit transactions. Publicly exposing this port without authentication has resulted in theft of Ethereum from hot wallets.

TCP Other Commonly Used

Security Considerations

Port 8545 (Ethereum JSON-RPC) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.

Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.

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)