Port 202AppleTalk Name Binding Protocol

AppleTalk Name Binding Protocol maps human-readable service names to AppleTalk network addresses.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as at-nbp, NBP

Technical Details

what runs on :202

NBP provides name registration and lookup for AppleTalk entities, returning address-and-name tuples that identify services on an AppleTalk network. Native NBP operates within AppleTalk's Datagram Delivery Protocol (DDP), while IANA lists port 202 for both TCP and UDP for implementations or encapsulations using the Internet transport suite. NBP traffic is generally request/response or registration-oriented rather than a long-lived application session.

Security Information

exposure of :202

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 3.3 across 811 ports — this one sits 2.3 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

NBP is not encrypted or designed as an Internet-facing service. Exposing it can disclose AppleTalk host and service names and may permit unauthorized registration or discovery on legacy networks, but the protocol is obsolete and rarely reachable; restrict it to trusted legacy segments and block it at Internet boundaries.

Record

iana registry entry

port: :202
service: AppleTalk Name Binding Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services System
usage: AppleTalk NBP registers, looks up, confirms, and removes service-name bindings so AppleTalk clients can discover servers. It is encountered primarily in legacy Macintosh and AppleTalk networks; modern Internet hosts rarely expose it.
lookups: 0rank 994
added: 2026-08-28
updated: 2026-08-28
references: IANA service name registry — port 202

Something wrong?

This record is maintained by the engineers who use port 202. 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 2026-08-28.

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all 811 in network services →

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :202AppleTalk Name Binding Protocol

Technical Details

Security Information

Related Ports

Port 202AppleTalk Name Binding Protocol