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Port 61
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Service
ni-mail
Protocol
X.25
Status
🪦 Obsolete — no longer in active use
Description
UK JANET Coloured Book mail protocol (Grey Book). Delivered mail over NIFTP (port 47) on X.25. IANA removed the assignment in 2017.
Citations
IANA registry
Coloured Book protocols (Wikipedia)
IEN 169 — A Simple NIFTP-Based Mail System (Bennett, 1981)
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