1123

RFC 1123 lists the requirements for internet host application software.

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Where 1123 fits

1123 connects to 3 worlds: mathematics, technology, related numbers.

It is the document that quietly permitted hostnames beginning with a digit, which is why 3com.com is a legal name.

1123 is part of

Other mathematical patterns

Documented appearance

The two documents divide host requirements between communication layers and application layers, and are cited as a pair.

Connection

RFC 952 forbade hostnames beginning with a digit and RFC 1123 relaxed the rule, which is why 3com.com is legal.

appears alongside1122
why?
Strength 0.50, confidence "high".
appears inNumbers that make the internet work
why?
Strength 0.50, confidence "high".

RFC 1123 amends and clarifies earlier application-level specifications rather than replacing them, including the relaxation of the hostname rule set in RFC 952.
DocumentedTechnology & computingGeography: International — IETFPeriod: 1989

Is 1123 a prime number?

Yes, 1123 is prime — it has exactly two positive divisors: 1 and itself.

What are the factors of 1123?

The factors of 1123 are 1, 1123.

What is 1123 in Roman numerals?

1123 in Roman numerals is MCXXIII.

About this page's data

Mathematical facts:computed directly from the number's value — nothing to source or verify externally.

Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.

Last reviewed: 3 August 2026