HTTPfy

Port 456 (macon-tcp, macon-udp)

IANA assigns port 456 to macon-tcp, macon-udp: macon-tcp.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
macon-tcp TCP macon-tcp Yoshinobu Inoue -
macon-udp UDP macon-udp Yoshinobu Inoue -

Check what is listening on port 456

Linux: is anything listening on TCP 456?
sudo ss -tlnp 'sport = :456'
Linux: UDP 456
sudo ss -ulnp 'sport = :456'
Linux / macOS: which process owns the port
sudo lsof -nP -i :456
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':456 '
Windows (Command Prompt)
netstat -ano | findstr :456
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 456 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 456
From Windows
Test-NetConnection HOST -Port 456
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 456

Block port 456 in the firewall

ufw
sudo ufw deny 456/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 456 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 456' -Direction Inbound -Protocol TCP -LocalPort 456 -Action Block
ufw
sudo ufw deny 456/udp
iptables
sudo iptables -A INPUT -p udp --dport 456 -j DROP
nftables
sudo nft add rule inet filter input udp dport 456 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 456' -Direction Inbound -Protocol UDP -LocalPort 456 -Action Block

Related ports

454contentserver455creativepartnr457scohelp458appleqtc

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