# Lookproof DNS NS Checker

> Lookproof DNS NS Checker is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Retrieves and analyzes a domain's name server set, including NS records, IPv4/IPv6 addresses for up to eight servers, glue record needs, and DNS redundancy information.

## Facts

- Endpoint: GET https://api.lookproof.dev/v1/dns/ns?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lookproof-dns-ns-checker-a640e262
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U9iSXRFsvMFxAtjOOl1Pw

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability lookproof-dns-ns-checker-a640e262
```

Example prompt: Can you check the name servers for example.com — I want to see all the NS records, their IPv4 and IPv6 addresses, and whether any of them fail to resolve or share the same /24 subnet?

## When to prefer this

Use this endpoint when you need a detailed, structured breakdown of a domain's name server infrastructure — specifically when assessing DNS redundancy, delegation correctness, glue record needs, or IPv6 coverage across the NS set. It is more thorough than a simple NS record lookup because it also resolves addresses, groups by subnet and TLD, and flags unresolvable servers. Prefer it over generic DNS tools when an agent needs to audit or validate DNS infrastructure programmatically.

## Known failure modes

- Domain does not exist or has no NS records — returns empty or error response
- Domain input missing or malformed — 400 bad request
- Name servers exist but none resolve — servers listed as non-resolving
- Payment not provided or insufficient — 402 Payment Required
- Rate limiting or upstream resolver failures — 429 or 5xx response

## How this service works

Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.

## Output

Returns the complete NS record set for the queried domain, including the hostnames of up to eight name servers, their IPv4 (A) and IPv6 (AAAA) addresses, identification of servers that fail to resolve, subnet groupings (/24 for IPv4, /48 for IPv6), TLD groupings across all name servers, and glue record requirements for in-zone name servers.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "title": "DomainInput",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "title": "Domain",
       "examples": [
        "example.com"
       ],
       "maxLength": 1024,
       "minLength": 1
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lookproof-dns-ns-checker-a640e262/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.lookproof.dev](https://www.zero.xyz/host/api.lookproof.dev/llms.txt)