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Port 552 (devshr-nts)

IANA assigns port 552 to devshr-nts: DeviceShare.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
devshr-nts TCP DeviceShare Benjamin Rosenberg -
devshr-nts UDP DeviceShare Benjamin Rosenberg -

Check what is listening on port 552

Linux: is anything listening on TCP 552?
sudo ss -tlnp 'sport = :552'
Linux: UDP 552
sudo ss -ulnp 'sport = :552'
Linux / macOS: which process owns the port
sudo lsof -nP -i :552
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':552 '
Windows (Command Prompt)
netstat -ano | findstr :552
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 552 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 552
From Windows
Test-NetConnection HOST -Port 552
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 552

Block port 552 in the firewall

ufw
sudo ufw deny 552/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 552 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 552 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 552' -Direction Inbound -Protocol TCP -LocalPort 552 -Action Block
ufw
sudo ufw deny 552/udp
iptables
sudo iptables -A INPUT -p udp --dport 552 -j DROP
nftables
sudo nft add rule inet filter input udp dport 552 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 552' -Direction Inbound -Protocol UDP -LocalPort 552 -Action Block

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