WhoisXML sells DNS records and reverse DNS as separate APIs, and 1Lookup returns both from one endpoint, with the mail provider and DNS host named, for $0.010 when records are found.

Checking the DNS records of a domain over an API, for example its mail servers and name servers. WhoisXML sells it as one of a family of domain data APIs: DNS Chronicle for history, Reverse DNS, Reverse IP, Reverse MX, Reverse NS, Subdomains Lookup, WHOIS and SSL certificates are all in its API menu, and its pages describe the lookup as checking MX, NS and other server records.

After 500 free queries on sign-up, monthly subscriptions sized in queries: 2,000 for $7, 5,000 for $14, 10,000 for $24, 20,000 for $39, 50,000 for $74, 100,000 for $124, 500,000 for $399, 1,000,000 for $599 and 2,000,000 for $899, with a custom plan above that. The pricing page also has one-time purchase and yearly subscription tabs, and WXA.ONE, a shared balance across WhoisXML API products, starts at $129 a month. Checked October 2026.

2 credits per name with records, free when the name has no records. On the Starter plan ($99 a month for 20,000 credits) a name is about $0.010, which covers 10,000 DNS lookups a month and is $9.90 per 1,000. At the Enterprise end of the rate card it is about $0.004.

No. WhoisXML works out to $3.50 per 1,000 queries at 2,000 a month, $2.40 at 10,000 and $1.24 at 100,000, against $9.90 per 1,000 on 1Lookup Starter and $4.00 on Enterprise. Even WhoisXML's smallest plan is under 1Lookup's Enterprise rate. What 1Lookup adds is a bill of zero when a name has no records, and a bigger answer from one call.

The A, AAAA, CNAME, MX, NS, TXT, CAA and SOA records of the name, including the SOA timers, plus two plain labels worked out from them: the mail provider, read from the MX hosts, and the DNS host, read from the name servers. An IP address in the same field returns its reverse DNS names. WhoisXML's pages do not describe a mail provider or DNS host label, and sell Reverse DNS as its own API.

When the domain does not exist, when it exists but has none of the eight record types, when an IP address has no reverse name, and when DNS does not answer in time, which returns a 503 with a Retry-After header. Each of those costs 0 credits. Only a name where something was found is billed.

On price per query at every tier it prints, on volume, since plans run to 2,000,000 queries a month with a custom plan above, and on the catalog around it: DNS history, reverse IP, reverse MX, reverse NS, subdomains, WHOIS and SSL data from one vendor, with monthly, yearly and one-time ways to pay. 1Lookup reads the current records of one name or address at a time.

Yes. Send an IP address instead of a domain to the same endpoint and 1Lookup returns the names published for it, free when it has none. WhoisXML lists Reverse DNS as a separate API in its menu. A CSV with a domain or IP column runs a whole list in one job.

If you query very large lists for the plain records, or need DNS history and reverse searches from the same vendor, WhoisXML is the cheaper and wider product. If you want one call that returns all eight record types with the mail provider and DNS host, takes an IP address too and bills nothing when it finds nothing, 1Lookup's DNS Lookup bills 2 credits for every name with records.

Yes for high-volume DNS work: it is cheaper per query than 1Lookup at every tier printed, and its plans go to 2,000,000 queries a month. Plan for the monthly quota, and for the fact that reverse lookups and DNS history are other APIs. If you look up a few thousand names a month to see where their mail and DNS are hosted, compare the per-name price of 1Lookup.