Check Bitcoin Port 8333
Test If Your Bitcoin Node Is Reachable
Enter your IP address to check if port 8333 is open and your Bitcoin Core node can accept incoming connections from other peers on the network.
Your current IP address:
216.73.216.216
How This Tool Works
TCP Connection Test
We attempt to establish a TCP connection to the specified IP and port from our server.
Bitcoin Protocol Handshake
If the port is open, we send a Bitcoin protocol version message to verify it's actually a Bitcoin node.
Report Results
We report whether your node is reachable and responding to the Bitcoin network protocol.
What is Bitcoin Port 8333?
The Default P2P Port
Port 8333 is the standard TCP port for Bitcoin's peer-to-peer network. When you run Bitcoin Core, it listens on this port for connections from other nodes. This enables your node to share blocks and transactions with the network.
Inbound vs Outbound
Your node can make outbound connections even without port 8333 open. But to accept inbound connections (making you a "listening node"), port 8333 must be accessible from the internet. This helps the network by serving data to new nodes.
Testnet & Other Ports
Bitcoin Testnet uses port 18333. You can also configure a custom port in bitcoin.conf with the 'port=' option, though this is uncommon as most nodes expect the standard port.
Troubleshooting: Port 8333 Not Open?
🔥 Check Your Firewall
On Linux, allow port 8333:
On Windows, create a firewall rule for Bitcoin Core.
🌐 Configure Port Forwarding
If you're behind a router/NAT:
1. Log into your router (usually 192.168.1.1)
2. Find "Port Forwarding" settings
3. Forward external port 8333 to your computer's local IP
⚙️ Verify Bitcoin Core Settings
Check your bitcoin.conf:
🏢 ISP or VPS Restrictions
Some ISPs block port 8333. Try using an alternative port (add 'port=8334' to bitcoin.conf). VPS providers usually don't block this port, but check their security group/firewall settings.
🧅 Use Tor Instead
If you can't open port 8333, consider running your node over Tor. Add to bitcoin.conf:
🔍 Test Locally First
Verify Bitcoin Core is listening:
Perguntas Frequentes
What is Bitcoin port 8333?
Port 8333 is the default TCP port used by Bitcoin Core for peer-to-peer network communication. Bitcoin nodes listen on this port to accept incoming connections from other nodes, enabling them to share blocks and transactions.
Why is my Bitcoin port 8333 closed?
Common reasons include: 1) Firewall blocking the port, 2) Router NAT without port forwarding configured, 3) ISP blocking the port, 4) Bitcoin Core not running or configured with listen=0, 5) VPS security group not allowing port 8333.
Do I need port 8333 open for Bitcoin Core to work?
No, it's optional. Your node will still sync and validate blocks via outbound connections. However, opening port 8333 helps the network by allowing your node to serve blocks to other peers. Nodes with open ports are more valuable to network health.
How do I open port 8333 on my router?
1) Access your router's admin panel (usually at 192.168.1.1 or 192.168.0.1). 2) Find "Port Forwarding" or "NAT" settings. 3) Add a new rule: External Port = 8333, Internal Port = 8333, Protocol = TCP, Internal IP = your computer's local IP address (e.g., 192.168.1.100).
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