Class C IP Subnet Checker
Paste a list of IP addresses, see them grouped by Class C subnet (/24 — first 3 octets). Useful for detecting which IPs share a hosting block, firewall rule grouping, or link-network analysis.
192.168.1.0/242 IPs192.168.1.10192.168.1.42203.0.113.0/242 IPs203.0.113.50203.0.113.9910.0.0.0/241 IP10.0.0.58.8.8.0/241 IP8.8.8.88.8.4.0/241 IP8.8.4.4What powers the Class C IP Subnet Checker
Paste any number of IPs
Grouped by /24 subnet
Counts per group
Invalid IP detection
Why the Class C IP Subnet Checker is different
Browser-native
The Class C IP Subnet Checker runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- SEO link audit (link network detection)
- Network admin grouping
- Firewall rule design
- OSINT analysis
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.