Port 206AppleTalk Zone Information

AppleTalk Zone Information service assigned to TCP and UDP port 206.

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

also known as at-zis, AppleTalk ZIP, Zone Information Service

Technical Details

what runs on :206

Port 206 is assigned for AppleTalk Zone Information over both TCP and UDP. ZIP exchanges control messages concerning zone-name queries, network-range mappings, and router-maintained zone information; deployments using UDP commonly use request/reply messages, while TCP provides a stream transport where supported. AppleTalk itself traditionally carried ZIP over AppleTalk DDP, so a TCP/UDP listener on 206 generally indicates an AppleTalk-over-IP implementation or gateway rather than a modern native IP application. Related historical AppleTalk service ports include RTMP on 201 and NBP on 202.

Security Information

exposure of :206

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 1,450 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

ZIP is a legacy, generally cleartext and unauthenticated control protocol. Internet exposure provides little legitimate value and can disclose internal AppleTalk topology and zone names; restrict it to trusted legacy segments or disable the gateway when AppleTalk is no longer required.

Record

iana registry entry

port: :206
service: AppleTalk Zone Information
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services System
usage: This is the legacy AppleTalk Zone Information Protocol (ZIP), used by AppleTalk routers and nodes to discover zone names and their associated network ranges. Engineers generally encounter it only on old AppleTalk networks, legacy gateways, or systems preserving AppleTalk compatibility.
lookups: 0rank 993
added: 2026-08-22
updated: 2026-09-22
references: IANA service name registry — port 206

Something wrong?

This record is maintained by the engineers who use port 206. 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 2026-09-22.

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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 :206AppleTalk Zone Information

Technical Details

Security Information

Related Ports

Port 206AppleTalk Zone Information