Port 535Internet Inter-ORB Protocol

CORBA object requests and replies exchanged using the Internet Inter-ORB Protocol (IIOP).

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 4/10
lookups: 0

also known as iiop, CORBA IIOP

Technical Details

what runs on :535

IIOP is the Internet mapping of CORBA's GIOP. A typical deployment establishes a TCP connection, exchanges length-framed GIOP messages, and performs request/reply operations against object references whose profiles identify the server endpoint. Standard IIOP is not encrypted; deployments requiring transport protection use SSL/TLS variants such as IIOP over SSL, commonly associated with port 684. Although this registry assignment lists both TCP and UDP, conventional IIOP implementations primarily use TCP.

Security Information

exposure of :535

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.0 across 1,020 ports — this one sits 1.0 above.

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

An exposed IIOP endpoint can disclose CORBA object references and expose remotely invokable methods, depending on ORB configuration and application authorization. It should generally remain restricted to trusted application networks; standard IIOP provides neither encryption nor authentication by itself, and ORB parsers and application objects add attack surface.

Record

iana registry entry

port: :535
service: Internet Inter-ORB Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 4/10caution
category: Network Services System
usage: IIOP carries CORBA General Inter-ORB Protocol (GIOP) messages between client and server ORBs, including object references, requests, and replies. Port 535 is an uncommon assignment; CORBA installations more often use configured ports such as 2809 for a naming service. The registry lists this assignment for both TCP and UDP.
lookups: 0rank 994
added: 2026-09-07
updated: 2026-09-07
references: IANA service name registry — port 535

Something wrong?

This record is maintained by the engineers who use port 535. 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 2026-09-07.

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edit this record →back to the registry

Related Ports

all 1,020 in network services →

the 8 most looked-up other ports in network services — 1,020 ports carry that label.

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:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :535Internet Inter-ORB Protocol

Technical Details

Security Information

Related Ports

Port 535Internet Inter-ORB Protocol