# dns-a-via-dnssb

> dns-a-via-dnssb is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Resolves DNS A records for a domain using DNS.SB's DNS-over-HTTPS resolver, returning records, TTL, response code, DNSSEC validation status, and answer time.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/a/via/dnssb?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-a-via-dnssb-5912a341
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I3axBLlIxyaj_eP-P3lEN

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 dns-a-via-dnssb-5912a341
```

Example prompt: Can you look up the A records for github.com using DNS.SB and tell me what IP addresses it resolves to, whether DNSSEC was validated, and how fast the resolver answered?

## When to prefer this

Use this endpoint when you specifically want to see how DNS.SB resolves A records for a domain — especially when comparing resolver behavior across providers (Google, Cloudflare, DNS.SB, AliDNS) to detect propagation lag, geographic or ISP-level filtering, or split-horizon DNS configurations. Prefer this over generic DNS tools when you need per-resolver granularity including DNSSEC validation state and answer latency.

## Known failure modes

- Domain does not exist — returns NXDOMAIN response code
- DNS.SB resolver is temporarily unavailable — returns SERVFAIL
- Network timeout reaching DNS.SB upstream — may return error or no answer
- Domain has no A records (IPv6-only or CNAME-only) — empty answer section with NOERROR
- Invalid or malformed domain name input — likely returns error or SERVFAIL

## How this service works

A records for a domain as answered by DNS.SB (DNS over HTTPS): the records, TTL, response code (NOERROR/NXDOMAIN/SERVFAIL), whether the resolver validated DNSSEC, and the resolver's answer time. Compare resolvers to spot propagation lag, filtering or split-horizon answers. $0.01 per lookup.

## Output

Returns the A records (IPv4 addresses) for the queried domain as answered by DNS.SB, including the TTL, the DNS response code (NOERROR, NXDOMAIN, or SERVFAIL), whether the resolver performed DNSSEC validation, and the resolver's answer latency in milliseconds.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dns-a-via-dnssb-5912a341/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)