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Port 1545 (vistium-share)

IANA assigns port 1545 to vistium-share.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vistium-share TCP vistium-share Allison Carleton -
vistium-share UDP vistium-share Allison Carleton -

Check what is listening on port 1545

Linux: is anything listening on TCP 1545?
sudo ss -tlnp 'sport = :1545'
Linux: UDP 1545
sudo ss -ulnp 'sport = :1545'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1545
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1545 '
Windows (Command Prompt)
netstat -ano | findstr :1545
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1545 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1545
From Windows
Test-NetConnection HOST -Port 1545
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1545

Block port 1545 in the firewall

ufw
sudo ufw deny 1545/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1545 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1545 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1545' -Direction Inbound -Protocol TCP -LocalPort 1545 -Action Block
ufw
sudo ufw deny 1545/udp
iptables
sudo iptables -A INPUT -p udp --dport 1545 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1545 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1545' -Direction Inbound -Protocol UDP -LocalPort 1545 -Action Block

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