Port 2535Multicast Address Dynamic Client Allocation Protocol (MADCAP)

MADCAP dynamically allocates multicast addresses to clients, typically over UDP port 2535.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

also known as madcap, Multicast Address Dynamic Client Allocation Protocol

Technical Details

what runs on :2535

MADCAP uses DHCP-like request and reply messages to allocate, renew, and release multicast addresses. Standard MADCAP exchanges use UDP, with the server listening on port 2535; IANA also lists TCP for the service, but that does not mean ordinary MADCAP deployments use TCP. It is a separate protocol from DHCP despite the similar message model.

Security Information

exposure of :2535

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.7 across 1,313 ports — this one sits 0.7 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

MADCAP is not encrypted by default, and its allocation requests should be treated as control traffic for a trusted multicast network. Avoid exposing it to the public internet: an accessible service may allow unwanted allocation requests or resource exhaustion, while spoofed traffic can interfere with allocation.

Record

iana registry entry

port: :2535
service: Multicast Address Dynamic Client Allocation Protocol (MADCAP)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: MADCAP is an IETF protocol for clients to request and manage multicast group addresses from an allocation server. It is uncommon today; engineers are more likely to encounter it on legacy or specialized multicast networks than on a typical public-facing host.
lookups: 0rank 993
added: 2026-09-23
updated: 2026-09-23
references: IANA service name registry — port 2535

Something wrong?

This record is maintained by the engineers who use port 2535. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-23.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :2535Multicast Address Dynamic Client Allocation Protocol (MADCAP)

Technical Details

Security Information

Related Ports

Port 2535Multicast Address Dynamic Client Allocation Protocol (MADCAP)