# 8333,18333,38333,18444 - Pentesting Bitcoin
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## Basic Information
* The **port 8333** is used by Bitcoin nodes in the **mainnet** to communicate between them.
* The **port 18333** is used Bitcoin nodes in the **testnet** to communicate between them.
* The **port 38333** is used Bitcoin nodes in the **signet** to communicate between them.
* The **port 18444** is used Bitcoin nodes in the **regtest** (local) to communicate between them.
**Default port:** 8333, 18333, 38333, 18444
```
PORT STATE SERVICE
8333/tcp open bitcoin
```
### Shodan
* `port:8333 bitcoin`
* `User-Agent: /Satoshi`
## Enumeration
Bitcoin nodes will give you some information if they think that you are another valid bitcoin node. **Nmap** have some script to extract this information:
```
sudo nmap -p 8333 --script bitcoin-info --script bitcoin-getaddr 170.39.103.39
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 170.39.103.39
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
[...]
```
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