Developer Documentation

Comprehensive IP address and network reference for network engineers, security analysts, and developers. Covers IP geolocation, ASN lookup, ISP data, IP ranges, port references, protocol specifications, threat profiles, RFCs, interactive network tools, glossary, and in-depth guides. 15 languages supported.

• IP address lookup with geolocation, ISP, ASN, and threat assessment
• Autonomous Systems (ASN) with prefix counts and peering data
• Cities with IP allocation statistics
• Internet Service Providers with coverage and network size
• IP ranges (CIDR blocks) with ownership and allocation
• Network port reference with service assignments
• Protocol specifications (TCP, UDP, ICMP, etc.)
• Threat profiles — DDoS, phishing, botnets, malware patterns
• RFC documents with summaries and cross-references
• Network scenarios — troubleshooting guides
• Internet timeline milestones
• Network worksheets — hands-on exercises
• Interactive tools: subnet calculator, IP converter, WHOIS, DNS lookup, SSL checker
• Networking glossary with categories
• In-depth guides organized by series
• Country-level internet statistics and comparisons

curl -s "https://ipfyi.com/api/v1/rest/asns/"

{
  "count": 636,
  "next": "https://example.com/api/v1/items/?page=2",
  "previous": null,
  "results": [
    {"slug": "example", "name": "Example Item", "...": "..."}
  ]
}