API Access
Programmatic access to WorldIP.io's IPv4 database — PTR records, geolocation, ASN data, and organization intelligence.
- ✓ Unlimited IP lookups (web)
- ✓ ASN, Org, Country browsing
- ✓ 3 PTR searches / day
- ✗ No API access
- ✗ No bulk exports
- ✓ REST API with JSON responses
- ✓ Bulk PTR / rDNS lookups
- ✓ IP → geolocation, ASN, org
- ✓ CIDR range enumeration
- ✓ PTR hostname search
- ✓ Dedicated API key
- ✓ Rate limits based on plan
- ✓ Everything in Pro
- ✓ Full PTR database export
- ✓ Daily delta feeds
- ✓ Webhook on PTR changes
- ✓ Custom integrations
- ✓ SLA & priority support
API Endpoints
| Endpoint | Description | Example |
|---|---|---|
| GET /api/v1/ip/{ip} | Full IP lookup — owner, ASN, geo, PTR | /api/v1/ip/8.8.8.8 |
| GET /api/v1/ptr/{ip} | PTR/rDNS record for a single IP | /api/v1/ptr/8.8.8.8 |
| POST /api/v1/ptr/bulk | Bulk PTR lookup (up to 1000 IPs) | {"ips": ["8.8.8.8", ...]} |
| GET /api/v1/ptr/search | Search PTR records by hostname pattern | ?q=mail&limit=100 |
| GET /api/v1/range/{cidr} | CIDR range details + all IPs | /api/v1/range/8.8.8.0/24 |
| GET /api/v1/asn/{asn} | ASN details + announced prefixes | /api/v1/asn/15169 |
API endpoints are not yet publicly available. Submit a quote request below to be notified when the API launches and to lock in early-access pricing.
Use Cases
Email Security
Verify sender IPs have matching PTR records. Bulk-check mail server infrastructure for deliverability compliance.
Network Monitoring
Resolve IPs in your logs to hostnames at scale. Identify infrastructure changes via PTR record diffs.
Threat Intelligence
Correlate IPs with hostnames to identify C2 infrastructure, phishing hosts, and suspicious PTR patterns.
Asset Discovery
Find all PTR records matching your organization's domain to discover shadow IT and forgotten infrastructure.
Request a Quote
Tell us about your use case and expected volume. We'll respond within 1-2 business days with pricing.