Network tools
Open Network tools on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.
Page guide
Find the right tool and get straight to your task.
No account needed.What is my IP
See the public IP address your connection presents.
Subnet calculator
Work out a subnet's address range and address count.
CIDR to range
Expand a CIDR block into its first and last IP addresses.
IP range to CIDR
Express an IP address range as CIDR blocks.
Ipv6 compress
Switch an IPv6 address between its short and expanded forms.
IP allowlist merger
Combine overlapping, duplicate and adjacent IPv4 and IPv6 ranges into the smallest exact CIDR list. No address outside your original entries is added.
IP range exclusion tool
Remove forbidden addresses, subnets or ranges from your allowed networks and get the exact remainder as the smallest CIDR list. Works with IPv4 and IPv6.
IPv6 prefix allocation planner
Plan subnets inside an IPv6 prefix without overlaps. Requests are placed largest first in a repeatable order, and anything that does not fit is listed along with the free space left.
IP lookup
Look up an IP address's network and approximate location.
Server unavailableWhois lookup
Find publicly available domain registration details.
Server unavailableDNS lookup
Look up the DNS records attached to a domain.
Server unavailableReverse DNS
Look up the hostname linked to an IP address.
Server unavailableDNS propagation
DNS propagation checks are not available yet.
Not available yetAbout network tools
These free online network tools help administrators, developers and curious users understand IP addresses and subnets. What is my IP shows the public address your connection presents to the internet. The Subnet calculator works out network ranges, masks and host counts, and CIDR to range and IP range to CIDR convert between notations. Ipv6 compress shortens IPv6 addresses, while the IP allowlist merger and IP range exclusion tool clean up firewall and access lists.
Use the planning tools before you change a live firewall or router. Merge and exclude ranges, review the output, then apply it, so a typo does not lock out users or open access you did not intend.
Popular network tools
Common questions
Does What is my IP contact another service?
Yes. To show your public address, the tool has to ask a provider what address your request came from. That provider receives the connection details it needs, including your IP address. A VPN or proxy will show its address instead of your own.
Do the subnet and CIDR tools send my addresses anywhere?
No. The Subnet calculator, CIDR to range, IP range to CIDR, Ipv6 compress and IP allowlist merger run in your browser. The ranges you enter are calculated on your device and are not sent to our server.
What does a CIDR suffix like /24 mean?
The number after the slash is how many leading bits identify the network. A /24 in IPv4 leaves 8 bits for hosts, which gives 256 addresses. The Subnet calculator shows the range, mask and usable host count for any prefix.