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Network Calc IPv6 Prefix Calculator
x402
Network Calc IPv6 Prefix Calculator is a paid API for AI agents from network-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates first/last address, size, /64 count, nth subnet, address type, and reverse DNS zone for an IPv6 CIDR prefix.
Price / call$0.02
Success—
StatusUnknown
How this service works
IPv6 prefix calculator: first and last address, size, number of /64s, the nth subnet, address type and reverse DNS zone.
Output
Returns the canonical CIDR, first and last addresses (both compressed and expanded), total address count, number of /64 and /48 subnets, prefix length, netmask, address type classification, reverse DNS zone string, and optionally details of the nth carved subnet including its own first/last addresses and total subnet count.
Example use cases
IPv6 block sizing for ISP allocation
“I'm about to assign a /48 to a customer — can you tell me the first and last address, how many /64s it contains, and what the reverse DNS zone is for 2001:db8:1234::/48?”
Finding the nth subnet in a block
“I need the 100th /64 subnet (zero-based index 99) carved out of 2001:db8::/32 — what's its CIDR, first address, and last address?”
Verifying IPv6 address type
“Can you check what type of IPv6 address 2001:db8:cafe::/64 is — like whether it's global unicast, link-local, or something else — and also give me its expanded first and last addresses?”
Technical details
Endpoint
GEThttps://network-calc.x402tookit.com/cidr-ipv6?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need detailed IPv6-specific prefix analysis — especially /64 and /48 subnet counts, address type classification, or reverse DNS zone generation. Prefer this over a generic CIDR comparison or IPv4 subnet tool when working exclusively with IPv6. Ideal for network automation, ISP provisioning, and DNS infrastructure tasks.
Side effects
- Invalid IPv6 prefix format returns an error or degraded response
- Host bits set in the address (e.g. 2001:db8::1/48) triggers a warning via hostBitsSet flag
- subnetPrefix smaller than or equal to the input prefix length returns an error
- index out of range for the given subnet carve returns an error or empty subnet object
- Non-IPv6 input (e.g. IPv4 CIDR) likely returns an error or unsupported response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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