HTTPfy

Port 12753 (tsaf)

IANA assigns port 12753 to tsaf: tsaf port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tsaf TCP tsaf port Andreas Fehr -
tsaf UDP tsaf port Andreas Fehr -

Check what is listening on port 12753

Linux: is anything listening on TCP 12753?
sudo ss -tlnp 'sport = :12753'
Linux: UDP 12753
sudo ss -ulnp 'sport = :12753'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12753
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12753 '
Windows (Command Prompt)
netstat -ano | findstr :12753
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12753 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12753
From Windows
Test-NetConnection HOST -Port 12753
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12753

Block port 12753 in the firewall

ufw
sudo ufw deny 12753/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12753 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12753 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12753' -Direction Inbound -Protocol TCP -LocalPort 12753 -Action Block
ufw
sudo ufw deny 12753/udp
iptables
sudo iptables -A INPUT -p udp --dport 12753 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12753 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12753' -Direction Inbound -Protocol UDP -LocalPort 12753 -Action Block

Related ports

12345italk12546carb-repl-ctrl12865netperf13160i-zipqd

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