Numberwise

1338

RFC 1338 introduced supernetting.

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Where 1338 fits

Where 1338 fits: History, Related numbersHistory: Historical years. Related numbers: 1918, 4632.HistoryHistorical yearsRelated numbers191846321338
1338 connects to 2 worlds: history, related numbers.

Why 1338 is special

It was the first step toward CIDR, motivated by a routing table that was growing faster than router memory could follow.

1338 connects to:

  • historical years — appears in
  • 1918 — is associated with
  • 4632 — developed from

Same number, different meanings

How 1338 is understood across different contexts — never implying one meaning because of another.

1338 is part of

Numbers around us

Factors & digit properties

Divisors (8)
1, 2, 3, 6, 223, 446, 669, 1338
Prime factorisation
2 × 3 × 223
Digit sum
15
Digital root
6

Representations

Decimal
1338
Scientific notation
1.338 × 10^3

Roman numerals

M C C C X X X V I I I

Binary

1 0 1 0 0 1 1 1 0 1 0

1 × 1,024 + 0 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 1,338

Octal

2 4 7 2

2 × 512 + 4 × 64 + 7 × 8 + 2 × 1 = 1,338

Hexadecimal

5 3 a

5 × 256 + 3 × 16 + a × 1 = 1,338

Read as powers of two: 1,024 + 256 + 32 + 16 + 8 + 2 = 1,338.

In historical numeral systems

Egyptian

1 lotus, 3 coils of rope, 3 hobbles, 8 strokes

1 × 1,000 + 3 × 100 + 3 × 10 + 8 × 1 = 1,338. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

Babylonian

2 corner wedges + 2 vertical wedges (sixties place), 1 corner wedge + 8 vertical wedges (units place)

22 × 60 + 18 = 1338. Places are separated by a space on the tablet, with the higher place written first.

Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.

Other mathematical patterns

  • Abundant number

Related numbers & connections

Documented appearance
1338 is a year in the 14th century, in the 1330s.

1338 is a year in the 14th century, in the 1330s.

Connection
Both were responses to IPv4 address pressure in the early 1990s, one by aggregation and one by reuse.

Both were responses to IPv4 address pressure in the early 1990s, one by aggregation and one by reuse.

View 1918 →

Numbers Around Us

  • appears inHistorical years
    why?

    Strength 0.50, confidence "high".

Other connections

  • is associated with1918
    why?

    Strength 0.50, confidence "high".

  • developed from4632
    why?

    Strength 0.50, confidence "high".

How is 1338 connected to another number? →

History

  • In 1338, the Ashikaga shogunate was established at Kyoto (Japan).

    DocumentedHistoryGeography: JapanPeriod: 1338

Technology & computing

  • RFC 1338 proposed supernetting to aggregate contiguous class C allocations, addressing routing table growth that threatened backbone router capacity in the early 1990s.

    DocumentedTechnology & computingGeography: International — IETFPeriod: 1992

Common questions

Is 1338 a prime number?

No, 1338 is not prime.

What are the factors of 1338?

The factors of 1338 are 1, 2, 3, 6, 223, 446, 669, 1338.

What is 1338 in Roman numerals?

1338 in Roman numerals is MCCCXXXVIII.

About this page's data

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

Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.

Last reviewed: 15 July 2026