IPv4ツール
IPv4アドレス、範囲、ネットワーク、および組織を調査するために必要なすべて。すべて無料で、サインアップは不要です。
IP Address Lookup
Look up any IPv4 address to find its owner, ASN, geolocation, reverse DNS, CIDR range, and blocklist status.
What Is My IP?
Instantly see your public IP address, ISP, ASN, country, city, and reverse DNS. No logs, no signup.
VPN & Proxy Check
See whether your IP is easily identifiable as a VPN, proxy, or datacenter — the way streaming sites and anti-fraud systems see it.
CIDR Range Lookup
Enter any CIDR block (e.g. 192.0.2.0/24) to see every IP in the range, the owner, ASN, and geographic distribution.
CIDR Calculator
Convert any IPv4 CIDR block to subnet mask, network, broadcast, host range, wildcard mask, and total IP count. Pure browser-based.
Subnet Cheatsheet
Every IPv4 prefix /0–/32 with subnet mask, total IPs, usable hosts, and common use cases. Bookmark-worthy reference.
Embeddable IP Widget
Drop a "what's my IP" box on your own website. One-line iframe or script. Theme + accent customization. Free.
REST API
Programmatic access for IP lookups, ASN/org data, CIDR enumeration, RIR ownership history. JSON responses.
ASN Search
Browse all Autonomous System Numbers. Find which ASNs belong to an ISP, cloud provider, or CDN, and see their IP ranges.
Organization Search
Find any organization's IPv4 allocations — total IPs owned, CIDR ranges, ASNs, and countries served.
Country IPv4 Stats
See how IPv4 addresses are distributed across 250 countries. Drill down to regions and cities.
