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IP Tools

Inspect any IPv4 address with IP Tools: subnet math, network and broadcast addresses, binary view, class detection and your public IP.

IPv4 analyzer

Enter an IPv4 address and a subnet. Results update live.

Enter an IP address above.
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How subnet math works

The CIDR prefix decides how many leading bits of the address identify the network. AND-ing the address with the subnet mask gives the network address; OR-ing with the inverted mask gives the broadcast address. Everything between them (minus those two) is usable host space.

Private vs public

Addresses in 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 are private (RFC 1918) and only route inside local networks. Everything else is public and routable on the internet. The tool flags which kind you entered.

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IP Tools FAQs

What does /24 mean?
It means the first 24 bits are the network part (mask 255.255.255.0), leaving 254 usable host addresses. Larger numbers mean smaller networks.
Why do /31 and /32 show no usable range?
/32 is a single host. /31 is a point-to-point link with 2 addresses and no broadcast, per RFC 3021.
What is the reverse DNS name for?
The in-addr.arpa name maps an IP back to a hostname via PTR records. Mail servers and network tools use it to verify senders.
Is my public IP lookup private?
It queries the free ipify service to learn your public address. The subnet analysis itself never leaves your browser.
Can it analyze IPv6?
No. This tool covers IPv4 only; IPv6 uses a different notation and much larger subnets.
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