# 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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