HTTPfy

Port 2258 (rcts)

IANA assigns port 2258 to rcts: Rotorcraft Communications Test System.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rcts TCP Rotorcraft Communications Test System Terry Eldridge -
rcts UDP Rotorcraft Communications Test System Terry Eldridge -

Registry dates for this port: registered 2006-08.

Check what is listening on port 2258

Linux: is anything listening on TCP 2258?
sudo ss -tlnp 'sport = :2258'
Linux: UDP 2258
sudo ss -ulnp 'sport = :2258'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2258
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2258 '
Windows (Command Prompt)
netstat -ano | findstr :2258
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2258 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2258
From Windows
Test-NetConnection HOST -Port 2258
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2258

Block port 2258 in the firewall

ufw
sudo ufw deny 2258/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2258 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2258 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2258' -Direction Inbound -Protocol TCP -LocalPort 2258 -Action Block
ufw
sudo ufw deny 2258/udp
iptables
sudo iptables -A INPUT -p udp --dport 2258 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2258 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2258' -Direction Inbound -Protocol UDP -LocalPort 2258 -Action Block

Related ports

2256pcc-mfp2257simple-tx-rx2259bid-serv2260apc-2260

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