HTTPfy

Port 2256 (pcc-mfp)

IANA assigns port 2256 to pcc-mfp: PCC MFP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pcc-mfp TCP PCC MFP Kunihiko Morota -
pcc-mfp UDP PCC MFP Kunihiko Morota -

Registry dates for this port: registered 2005-08.

Check what is listening on port 2256

Linux: is anything listening on TCP 2256?
sudo ss -tlnp 'sport = :2256'
Linux: UDP 2256
sudo ss -ulnp 'sport = :2256'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2256
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2256 '
Windows (Command Prompt)
netstat -ano | findstr :2256
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2256 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2256
From Windows
Test-NetConnection HOST -Port 2256
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2256

Block port 2256 in the firewall

ufw
sudo ufw deny 2256/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2256 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2256 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2256' -Direction Inbound -Protocol TCP -LocalPort 2256 -Action Block
ufw
sudo ufw deny 2256/udp
iptables
sudo iptables -A INPUT -p udp --dport 2256 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2256 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2256' -Direction Inbound -Protocol UDP -LocalPort 2256 -Action Block

Related ports

2254seispoc2255vrtp2257simple-tx-rx2258rcts

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.