# FirstSales DNS API

**Canonical:** https://apis.io/apis/firstsales-io/firstsales-io-dns-api/  
**Provider:** FirstSales — https://apis.io/providers/firstsales-io/  
**Base URL:** https://firstsales.io  
**Documentation:** https://developer.firstsales.io/api-reference/introduction

FirstSales DNS API is one of 7 APIs that [FirstSales](https://apis.io/providers/firstsales-io/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 1 JSON Schema definition. Tagged areas include DNS. The published artifact set on APIs.io includes an OpenAPI specification and 1 JSON Schema.

DNS record and deliverability diagnostics.

## Operations (4)

| Method | Path | Summary |
|---|---|---|
| POST | `/api/v1/dns/check` | Run one specific DNS/email-authentication/security check against a domain |
| POST | `/api/v1/dns/dkim` | Look up and validate a domain's DKIM record |
| POST | `/api/v1/dns/validate` | Run SPF, DKIM, DMARC, and MX checks together with a confidence score |
| POST | `/api/v1/dns/reverse` | Reverse-DNS (PTR) lookup for an IPv4 address, with forward-confirmation |

## Machine-readable artifacts (2)

- **OpenAPI** — https://artifacts.apis.io/firstsales-io/openapi/firstsales-io-dns-api-openapi.yml
- **JSONSchema** — https://artifacts.apis.io/firstsales-io/json-schema/firstsales-io-dkim-result-schema.json

## Other FirstSales APIs (6)

- [FirstSales Analyze API](https://apis.io/apis/firstsales-io/firstsales-io-analyze-api/)
- [FirstSales Domain API](https://apis.io/apis/firstsales-io/firstsales-io-domain-api/)
- [FirstSales Email API](https://apis.io/apis/firstsales-io/firstsales-io-email-api/)
- [FirstSales Mail Tester API](https://apis.io/apis/firstsales-io/firstsales-io-mail-tester-api/)
- [FirstSales System API](https://apis.io/apis/firstsales-io/firstsales-io-system-api/)
- [FirstSales Tutorials API](https://apis.io/apis/firstsales-io/firstsales-io-tutorials-api/)

## Tags

DNS

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/firstsales-io/firstsales-io-dns-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/firstsales-io/.