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Port 1861 (lecroy-vicp)

IANA assigns port 1861 to lecroy-vicp: LeCroy VICP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lecroy-vicp TCP LeCroy VICP Anthony Cake -
lecroy-vicp UDP LeCroy VICP Anthony Cake -

Check what is listening on port 1861

Linux: is anything listening on TCP 1861?
sudo ss -tlnp 'sport = :1861'
Linux: UDP 1861
sudo ss -ulnp 'sport = :1861'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1861
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1861 '
Windows (Command Prompt)
netstat -ano | findstr :1861
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1861 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1861
From Windows
Test-NetConnection HOST -Port 1861
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1861

Block port 1861 in the firewall

ufw
sudo ufw deny 1861/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1861 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1861 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1861' -Direction Inbound -Protocol TCP -LocalPort 1861 -Action Block
ufw
sudo ufw deny 1861/udp
iptables
sudo iptables -A INPUT -p udp --dport 1861 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1861 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1861' -Direction Inbound -Protocol UDP -LocalPort 1861 -Action Block

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