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Port 2257 (simple-tx-rx)

IANA assigns port 2257 to simple-tx-rx: simple text/file transfer.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
simple-tx-rx TCP simple text/file transfer Daniel Kilsdonk -
simple-tx-rx UDP simple text/file transfer Daniel Kilsdonk -

Registry dates for this port: registered 2006-08.

Check what is listening on port 2257

Linux: is anything listening on TCP 2257?
sudo ss -tlnp 'sport = :2257'
Linux: UDP 2257
sudo ss -ulnp 'sport = :2257'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2257
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2257 '
Windows (Command Prompt)
netstat -ano | findstr :2257
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2257 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2257
From Windows
Test-NetConnection HOST -Port 2257
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2257

Block port 2257 in the firewall

ufw
sudo ufw deny 2257/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2257 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2257 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2257' -Direction Inbound -Protocol TCP -LocalPort 2257 -Action Block
ufw
sudo ufw deny 2257/udp
iptables
sudo iptables -A INPUT -p udp --dport 2257 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2257 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2257' -Direction Inbound -Protocol UDP -LocalPort 2257 -Action Block

Related ports

2255vrtp2256pcc-mfp2258rcts2259bid-serv

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.