ASN Converter
Enter an ASN in any format and I show its asplain ↔ asdot equivalence, whether it is 16- or 32-bit and whether it is public, private or reserved (0, 23456 AS_TRANS, etc.).
asdot breakdown · high.low
| Part | Decimal | Formula |
|---|
How it is computed · asplain, asdot and ranges
1. An ASN is an unsigned
32-bit integer: from 0 to
4294967295 (2³² − 1).
2. asdot+ splits it in two:
high = ⌊asn / 65536⌋ and low = asn mod 65536,
written as high.low.
3. asdot is the short form:
equal to asplain when the ASN is < 65536
(16-bit); otherwise it is high.low. E.g. 65546 →
1.10.
4. 16-bit: 0–65535.
32-bit: 65536 and up.
Private: 64512–65534 (16-bit)
and 4200000000–4294967294 (32-bit).
5. Reserved:
0, 23456 (AS_TRANS),
65535, 4294967295,
documentation (64496–64511 and 65536–65551).
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