HTTPfy

Port 2535 (madcap)

IANA assigns port 2535 to madcap: MADCAP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
madcap TCP MADCAP Stephen Hanna 2 -
madcap UDP MADCAP Stephen Hanna 2 -

Check what is listening on port 2535

Linux: is anything listening on TCP 2535?
sudo ss -tlnp 'sport = :2535'
Linux: UDP 2535
sudo ss -ulnp 'sport = :2535'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2535
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2535 '
Windows (Command Prompt)
netstat -ano | findstr :2535
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2535 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2535
From Windows
Test-NetConnection HOST -Port 2535
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2535

Block port 2535 in the firewall

ufw
sudo ufw deny 2535/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2535 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2535 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2535' -Direction Inbound -Protocol TCP -LocalPort 2535 -Action Block
ufw
sudo ufw deny 2535/udp
iptables
sudo iptables -A INPUT -p udp --dport 2535 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2535 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2535' -Direction Inbound -Protocol UDP -LocalPort 2535 -Action Block

Related ports

2533snifferserver2534combox-web-acc2536btpp2audctr12537upgrade

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