Port 1191IBM General Parallel File System (GPFS)

GPFS uses port 1191 for communication between nodes in an IBM Spectrum Scale parallel filesystem cluster.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 7/10
lookups: 0

also known as gpfs, General Parallel File System, IBM Spectrum Scale, IBM GPFS

Technical Details

what runs on :1191

GPFS uses both TCP and UDP port 1191 for cluster-internal daemon communication and related filesystem operations. It is a proprietary service between trusted nodes in the same Spectrum Scale cluster; the exact message exchanges and framing depend on the GPFS release and enabled cluster features. It should be permitted only between the required cluster members, alongside any other ports specified by the deployed Spectrum Scale configuration.

Security Information

exposure of :1191

risk score

7/ 10risk

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

system averages 3.4 across 448 ports — this one sits 3.6 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

Port 1191 is not intended for direct Internet exposure. An exposed endpoint reveals a clustered storage service and may permit protocol probing or unauthorized interaction if cluster authentication, network controls, or software security are weak; compromise of a GPFS node can also expose shared filesystem data. Restrict it to cluster networks and use the product's supported security and encryption settings where required.

Record

iana registry entry

port: :1191
service: IBM General Parallel File System (GPFS)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 7/10risk
category: System
usage: Port 1191 is used by IBM General Parallel File System, now IBM Spectrum Scale, for internal communication among cluster nodes. Engineers typically encounter it on high-performance computing, analytics, and clustered storage networks rather than on ordinary file servers.
lookups: 0rank 994
added: 2026-08-24
updated: 2026-08-24
references: IANA service name registry — port 1191

Something wrong?

This record is maintained by the engineers who use port 1191. 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 2026-08-24.

01edit any field on a page of its own
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edit this record →back to the registry

Related Ports

all 448 in system →

the 8 most looked-up other ports in system — 448 ports carry that label.

port	service	proto	category	risk	views
:8888	Sun Answerbook & Alt HTTP	TCP	Web Services	caution	123.9k
:4664	Google Desktop Search	TCP	System	caution	67.2k
:8008	IBM HTTP Server Admin	TCP	Web Services	caution	58.3k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:9080	WebSphere HTTP Transport (default)	TCP	Web Services	caution	51.6k
:23	Telnet	TCP	Remote Access	caution	34.8k
:12489	NSClient Monitoring Agent	TCP	Network Services	caution	30.0k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :1191IBM General Parallel File System (GPFS)

Technical Details

Security Information

Related Ports

Port 1191IBM General Parallel File System (GPFS)