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// HackTricks · Network Services

8333, 18333, 38333, 48333, 18444 - Pentesting Bitcoin

8333, 18333, 38333, 48333, 18444 - Pentesting Bitcoin

Basic Information

  • 8333/TCP is Bitcoin Core’s default mainnet peer-to-peer port.
  • 18333/TCP is the default testnet3 peer-to-peer port.
  • 38333/TCP is the default signet peer-to-peer port.
  • 48333/TCP is the default testnet4 peer-to-peer port.
  • 18444/TCP is the default regtest peer-to-peer port.

These defaults come from Bitcoin Core’s chain parameters and can be overridden in a node’s configuration.[1] Bitcoin peer-to-peer traffic uses TCP.[2]

Default ports: 8333, 18333, 38333, 48333, 18444

PORT      STATE SERVICE
8333/tcp open  bitcoin

Shodan

  • port:8333 bitcoin
  • User-Agent: /Satoshi

Enumeration

Bitcoin peers exchange version and address messages as part of the peer-to-peer protocol. Nmap’s bitcoin-info script extracts version and node information, while bitcoin-getaddr asks a peer for known node addresses.[3][4]

sudo nmap -p 8333 --script bitcoin-info --script bitcoin-getaddr <IP>
PORT     STATE SERVICE
8333/tcp open  bitcoin
| bitcoin-info:
|   Timestamp: 2022-04-08T22:33:58
|   Network: main
|   Version: 0.7.0
|   Node Id: 1bea074ea4f6eca3
|   Lastblock: 731027
|_  User Agent: /Satoshi:0.19.1/

sudo nmap -p 8333 --script bitcoin-getaddr <IP>
PORT     STATE SERVICE
8333/tcp open  bitcoin
| bitcoin-getaddr:
|   ip                                            timestamp
|   2a02:c7e:486a:2b00:3d26:db39:537f:59f2:8333   2022-03-25T07:30:45
|   2600:1f1c:2d3:2403:7b7d:c11c:ca61:f6e2:8333   2022-04-08T07:16:38
|   75.128.4.27:8333                              2022-04-02T08:10:45
[...]

References