ASNDNS runs authoritative DNS on an anycast edge with geo-steering and health-checked failover — and exposes the ASN, prefix and BGP data behind every answer through one JSON API. Built for engineers who read packet captures for fun.
Anycast resolution · DNSSEC · RFC 2136 dynamic updates · Terraform provider
Enter a domain, IP address or AS number. This queries the same API and the same dataset a paying client gets — nothing here is mocked.
Route by continent, country, subdivision or client ASN. Weighted pools split traffic in fractions you set, and every rule is a plain record in the zone — no side console.
HTTP, TCP and ICMP probes from multiple regions. A pool that fails consensus is withdrawn from answers within one TTL, and returns only after it holds healthy.
ASN, prefix, RIR allocation, reverse lookups and announced address space — one JSON endpoint, one token, cursor pagination, no per-field surcharge.
The API and dashboard run at the edge, so a record change propagates from wherever you called it. Zone files, Terraform and REST all write to the same state.
Enrich a request with the client's ASN before you decide how to serve it — inside the same edge runtime, without leaving the request path. Rate limits are per token and returned in headers.
export default {
async fetch(request, env) {
const ip = request.headers.get("cf-connecting-ip");
const r = await fetch(
`https://api.asndns.com/v1/ip/${ip}`,
{ headers: { authorization: `Bearer ${env.ASNDNS_TOKEN}` } }
);
const { asn, holder, prefix, country } = await r.json();
// asn: 13335 · holder: "CLOUDFLARENET" · prefix: "1.1.1.0/24"
return Response.json({ routedFor: asn, holder, prefix, country });
}
};
Import an existing zone file or AXFR from your current provider, verify answers side by side, then cut the NS records over when the diff is clean.
Managed authoritative DNS and the network-intelligence API share one account, one token scope model and one audit log. Use either on its own; they compose when you use both.
Anycast nameservers answer from the nearest edge location. Records, pools and steering rules are versioned, and every change is diffable before it ships.
Resolve an address to the network that announces it, then walk outward — allocation, registry, announced space and reverse records.
/v1/ip/{ip} — ASN, holder, covering prefix, PTR/v1/asn/{asn} — RIR, allocation date, prefix counts/v1/asn/{asn}/prefixes — full announced list/v1/domain/{name} — records plus the network behind them| Type | Purpose | Steering |
|---|---|---|
| A / AAAA | Address records for IPv4 and IPv6 origins | Geo, weighted, failover |
| CNAME | Alias onto another name | Geo, weighted |
| ALIAS | Apex alias that resolves to addresses | Geo, weighted, failover |
| MX | Mail exchangers with preference | Flat |
| TXT | SPF, DKIM, DMARC and domain verification | Flat |
| SRV | Service location with port and priority | Weighted |
| CAA | Certificate authority authorisation | Flat |
| NS / DS | Delegation and DNSSEC chain of trust | Flat |
Answer with the origin closest to the querying resolver, and fall back to a shared region when a pool drops out.
Look up the client ASN at request time and serve from the origin with the shortest path to that network.
Tag a new account with the network it registered from — hosting, mobile or residential — before it reaches your risk rules.
Every plan runs on the same network. Paying more raises limits and adds operational features — it never buys you a faster answer.
$0 / month
For side projects and evaluation. Same anycast network as every other plan.
$20 / month
For production services that need health-checked failover and higher volume.
$200 / month
For platforms serving many customer zones through one account.
| Meter | Included | Over the allowance |
|---|---|---|
| DNS queries | Per plan allowance | $0.30 / million |
| API requests | Per plan allowance | $1.00 / 100k |
| Additional zones | Per plan allowance | $0.50 / zone / month |
| Health check targets | 5 per zone | $1.00 / target / month |
One answered DNS question at an authoritative nameserver. Retries for the same question within the TTL are not counted twice.
Answers keep being served. Overage is metered at the rates above and billed at the end of the cycle — resolution is never suspended for usage.
Export every zone as a standard zone file at any time, from the API or the dashboard, with no notice period and no export fee.
Yes, on Pro and Scale, billed once a year. Write to us with your zone count and query volume and we will quote it.
ASNDNS LLC is a California company building in one narrow place: the moment a name becomes an address, and everything you can learn about the network that address belongs to. We do not sell compute, storage or a bundle you have to grow into.
An endpoint reaches the public API only once its reference page, error codes and rate-limit behaviour are written down. No undocumented surface.
Zones export as standard zone files and API results as plain JSON. Nothing is stored in a format only we can read.
Answers are served whether or not an invoice is open. Usage disputes are settled in email, not by withdrawing your records.
| Legal entity | ASNDNS LLC |
| Jurisdiction | California, United States |
| Founded | 2026 |
| Focus | Authoritative DNS hosting and network intelligence data |
| Contact | support@asndns.com |
Technical questions reach an engineer, not a queue. Include the zone, the query volume or the API response you are asking about and you will get a specific answer.
support@asndns.com — accounts, zones, API
abuse@asndns.com — abuse and takedown
billing@asndns.com — invoices and plans
Postal address for legal notice. Technical and billing matters are handled by email.