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Port 49001 (nusrp, nusdp-disc)

IANA assigns port 49001 to nusrp, nusdp-disc: Nuance Unity Service Request Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nusrp TCP Nuance Unity Service Request Protocol Nuance Communications Inc3 -
nusdp-disc UDP Nuance Unity Service Discovery Protocol Nuance Communications Inc3 -

Registry dates for this port: registered 2017-04-20.

Check what is listening on port 49001

Linux: is anything listening on TCP 49001?
sudo ss -tlnp 'sport = :49001'
Linux: UDP 49001
sudo ss -ulnp 'sport = :49001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :49001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':49001 '
Windows (Command Prompt)
netstat -ano | findstr :49001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 49001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 49001
From Windows
Test-NetConnection HOST -Port 49001
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 49001

Block port 49001 in the firewall

ufw
sudo ufw deny 49001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 49001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 49001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 49001' -Direction Inbound -Protocol TCP -LocalPort 49001 -Action Block
ufw
sudo ufw deny 49001/udp
iptables
sudo iptables -A INPUT -p udp --dport 49001 -j DROP
nftables
sudo nft add rule inet filter input udp dport 49001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 49001' -Direction Inbound -Protocol UDP -LocalPort 49001 -Action Block

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