Port 3205Internet Storage Name Service (iSNS)

iSNS servers help storage clients discover and manage iSCSI and other storage resources on a SAN.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 5/10
lookups: 0

also known as isns, iSNS Server Port

Technical Details

what runs on :3205

iSNS is a binary discovery and management protocol for storage networks, specified in RFC 4171. Servers listen on TCP and UDP port 3205; messages use a 12-byte header followed by length-delimited attributes, and TCP messages are framed using the length in that header. Clients register storage entities and query for resources such as iSCSI nodes, while the server maintains discovery information and can organize resources into discovery domains. Traffic is not encrypted by default; deployments rely on network isolation or separately configured protections.

Security Information

exposure of :3205

risk score

5/ 10caution

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

network services averages 2.7 across 1,370 ports — this one sits 2.3 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 iSNS server can reveal storage-system names, addresses, and topology, and permitted registration or management operations could affect what clients discover. Keep it on a restricted SAN network and limit access to trusted storage clients; do not make it internet-facing. The protocol does not encrypt traffic by default, and protections depend on deployment configuration.

Record

iana registry entry

port: :3205
service: Internet Storage Name Service (iSNS)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 5/10caution
category: Network Services
usage: Storage-area-network administrators encounter iSNS on servers that maintain registrations and discovery information for iSCSI devices. Clients use it to find storage resources; it is generally used on a private storage network, not exposed to the public internet.
lookups: 0rank 993
added: 2026-09-28
updated: 2026-09-28
references: IANA service name registry — port 3205
RFC 4171

Something wrong?

This record is maintained by the engineers who use port 3205. 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 2026-09-28.

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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 :3205Internet Storage Name Service (iSNS)

Technical Details

Security Information

Related Ports

Port 3205Internet Storage Name Service (iSNS)