Port 683CORBA IIOP

CORBA's Internet Inter-ORB Protocol for communicating with distributed objects, normally over TCP port 683.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 6/10
lookups: 0

also known as Internet Inter-ORB Protocol

Technical Details

what runs on :683

IIOP carries CORBA's General Inter-ORB Protocol (GIOP) over IP, normally using TCP; the registry also lists UDP, although standard IIOP deployments are predominantly connection-oriented TCP. ORBs exchange GIOP messages containing requests, replies, locate operations, and management messages, using Common Data Representation (CDR) encoding. Object references (IORs) identify endpoints and may specify ports other than 683; TLS-protected SSLIOP is used when confidentiality and authentication are required.

Security Information

exposure of :683

risk score

6/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 3.9 across 616 ports — this one sits 2.1 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

IIOP is not encrypted by default, and an exposed ORB can reveal object references or accept unauthenticated remote method invocations depending on its configuration. Internet-facing CORBA endpoints should generally be blocked or restricted to trusted networks, with authentication, authorization, and SSLIOP/TLS applied where exposure is unavoidable.

Record

iana registry entry

port: :683
service: CORBA IIOP
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 6/10risk
category: Network Services System
usage: CORBA Object Request Brokers use IIOP to locate and invoke objects across process and host boundaries. Enterprise middleware, telecom, industrial, and legacy distributed systems may expose it, though it is uncommon on the public internet.
lookups: 0rank 994
added: 2026-08-20
updated: 2026-08-20
references: IANA service name registry — port 683

Something wrong?

This record is maintained by the engineers who use port 683. 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 2026-08-20.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 616 in network services →

the 8 most looked-up other ports in network services — 616 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
: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 :683CORBA IIOP

Technical Details

Security Information

Related Ports

Port 683CORBA IIOP