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Port 4752 (snap)

IANA assigns port 4752 to snap: Simple Network Audio Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
snap TCP Simple Network Audio Protocol Dameon Wagner -
snap UDP Simple Network Audio Protocol Dameon Wagner -

Registry dates for this port: registered 2002-02.

Check what is listening on port 4752

Linux: is anything listening on TCP 4752?
sudo ss -tlnp 'sport = :4752'
Linux: UDP 4752
sudo ss -ulnp 'sport = :4752'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4752
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4752 '
Windows (Command Prompt)
netstat -ano | findstr :4752
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4752 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4752
From Windows
Test-NetConnection HOST -Port 4752
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4752

Block port 4752 in the firewall

ufw
sudo ufw deny 4752/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4752 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4752 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4752' -Direction Inbound -Protocol TCP -LocalPort 4752 -Action Block
ufw
sudo ufw deny 4752/udp
iptables
sudo iptables -A INPUT -p udp --dport 4752 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4752 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4752' -Direction Inbound -Protocol UDP -LocalPort 4752 -Action Block

Related ports

4750ssad4751spocp4753simon, simon-disc4754gre-in-udp

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