Port 499ISO ILL Protocol

Port for the ISO Interlibrary Loan protocol used by library systems.

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

Technical Details

what runs on :499

ISO ILL is the application protocol associated with the ISO 10160/10161 interlibrary-loan standards. The registry assigns port 499 for both TCP and UDP; implementations use it for ILL application exchanges rather than general-purpose web or file-transfer traffic. The protocol is rarely encountered on today's public Internet, and deployment-specific documentation is needed to determine the exact framing and transport behavior of a listener.

Security Information

exposure of :499

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 2.6 across 1,628 ports — this one sits 0.6 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

The protocol is not generally expected to provide modern transport encryption by default, so sensitive lending requests and library metadata should be protected with a secure tunnel or restricted to trusted networks. Because public exposure is unusual, an unexpected listener should be identified and validated against the host's library software before allowing Internet access.

Record

iana registry entry

port: :499
service: ISO ILL Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: This port is assigned to the ISO Interlibrary Loan (ILL) protocol, used for interlibrary-loan transactions between library automation systems. It is an uncommon deployment, typically found only in specialized library or information-service networks.
lookups: 0rank 993
added: 2026-08-27
updated: 2026-09-22
references: IANA service name registry — port 499

Something wrong?

This record is maintained by the engineers who use port 499. 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.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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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 :499ISO ILL Protocol

Technical Details

Security Information

Related Ports

Port 499ISO ILL Protocol