3128
Port 3128 is the default port for the Squid caching proxy.
- Even
- Composite
Where 3128 fits
Why 3128 is special
Squid sits between users and the web, caching what it fetches. An accidentally open 3128 becomes an anonymising relay for anyone who finds it, which is why scanning for open proxies on this port is continuous.
Factors & digit properties
- Divisors (16)
- 1, 2, 4, 8, 17, 23, 34, 46, 68, 92, 136, 184, 391, 782, 1564, 3128
- Prime factorisation
- 2^3 × 17 × 23
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 3128
- Scientific notation
- 3.128 × 10^3
Roman numerals
M M M C X X V I I I
Binary
1 1 0 0 0 0 1 1 1 0 0 0
1 × 2,048 + 1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 3,128
Octal
6 0 7 0
6 × 512 + 0 × 64 + 7 × 8 + 0 × 1 = 3,128
Hexadecimal
c 3 8
c × 256 + 3 × 16 + 8 × 1 = 3,128
Read as powers of two: 2,048 + 1,024 + 32 + 16 + 8 = 3,128.
In historical numeral systems
Egyptian
3 lotuses, 1 coil of rope, 2 hobbles, 8 strokes
3 × 1,000 + 1 × 100 + 2 × 10 + 8 × 1 = 3,128. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 corner wedges + 2 vertical wedges (sixties place), 8 vertical wedges (units place)
52 × 60 + 8 = 3128. 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
Two kinds of proxy: Squid on 3128 understands HTTP and caches it, while SOCKS on 1080 forwards arbitrary TCP without interpreting it. Both become open relays if exposed.
View 1080 →Technology & computing
Squid caches web content between users and the internet. Left open to the world, port 3128 becomes a relay anyone can route traffic through, which is why scanning for open proxies on it is continuous and automated.
DocumentedTechnology & computing
Common questions
Is 3128 a prime number?
No, 3128 is not prime.
What are the factors of 3128?
The factors of 3128 are 1, 2, 4, 8, 17, 23, 34, 46, 68, 92, 136, 184, 391, 782, 1564, 3128.
What is 3128 in Roman numerals?
3128 in Roman numerals is MMMCXXVIII.
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: 15 July 2026