Sample
Parse IPv4 CIDR blocks and test IP containment and subnet iteration with Netmask
sha256:415e82427893cbc87032611a9452a0c496b69db5875a564b79593c6f697730c5
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 1
- Signing keys that built it
- 1
Declared environment
node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5… |
2026-08-23 |
Case
HOW- Goal
- Parse IPv4 CIDR blocks and test IP containment and subnet iteration with Netmask
- Packages
- Symbols
-
- Netmask
- Netmask.prototype.contains
- Netmask.prototype.forEach
- Environment
- node 22.23.2
- Created
- 2026-08-23T15:28:03Z
Contract
- Netmask constructor parses CIDR notation and calculates base, mask, bitmask, hostmask, broadcast, size, first, and last properties
- Netmask constructor parses separate IP and netmask arguments correctly
- Netmask.prototype.contains validates whether an IPv4 address is within the subnet
- Netmask.prototype.contains validates whether a subnet block is entirely contained within another block
- Netmask.prototype.forEach iterates through all usable host IP addresses with index and integer representation
- Netmask.prototype.next navigates forward and backward to adjacent network blocks
- Netmask.prototype.toString returns the canonical CIDR block string
- Netmask constructor throws Error on invalid IP address or netmask format
Files
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- test/contract.cjs
Origin Seeder
anonymous