IPv6 Hex Converter
Turn an IPv6 address into a bare 32-digit hex string, 0x literal and reverse-DNS nibble format.
About IPv6 Hex Converter
A flat hex string is the form used by databases, TCAM entries and log pipelines. Reverse DNS uses the same digits in reverse order, one nibble per label. PTR records for IPv6 are painful to build by hand, and a single transposed nibble makes reverse lookups fail in ways that are hard to spot.
Formula
IPv6 Hex
The eight groups are concatenated into 32 hex digits; reversing the digits and joining them with dots gives the ip6.arpa name.
- ip6.arpa
- Reverse DNS zone for IPv6, one label per hex nibble
Worked example
With the default values below, IPv6 Hex Converter returns 32-digit Hex of 20010db8000000000000000000000001. Change any input above and every figure here is recalculated in your browser.
Inputs used
- IPv6 address
- 2001:db8::1
Results
- 32-digit Hex
- 20010db8000000000000000000000001
- 0x Literal
- 0x20010db8000000000000000000000001
- Reverse DNS (ip6.arpa)
- 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa
- Hex Digits
- 32
Step by step
- 1Values used
- 2IPv6 Hex
- 332-digit Hex= 20010db8000000000000000000000001
- 40x Literal= 0x20010db8000000000000000000000001
- 5Reverse DNS (ip6.arpa)= 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa
- 6Hex Digits= 32
Assumptions and limits
- The result is derived only from the single input listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is IPv6 Hex calculated?
The eight groups are concatenated into 32 hex digits; reversing the digits and joining them with dots gives the ip6.arpa name. A flat hex string is the form used by databases, TCAM entries and log pipelines. Reverse DNS uses the same digits in reverse order, one nibble per label.
Why does IPv6 Hex matter?
PTR records for IPv6 are painful to build by hand, and a single transposed nibble makes reverse lookups fail in ways that are hard to spot.
What values do I need to enter?
This calculator takes 1 input: IPv6 address. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.