Network Tools
Network questions tend to arrive as small, specific puzzles: what range does this CIDR block actually cover, what is this IP in decimal, which port should a local service use, and what browser is really behind this user-agent string. Each has a definite answer and none of them justify a heavyweight toolkit.
Craftisle has four network tools answering those. They run in the browser, so you can inspect addresses and agent strings from your own traffic without uploading them.
Addresses and ranges
IP Calculator takes an address and works out the network details around it — the calculation behind subnetting questions that are easy to get wrong in your head.
IP Radix Converter moves an address between representations, which is what you need when one system logs dotted decimal and another stores integers.
Ports and agent strings
Random Port Generator picks a port number, useful when you are standing up a local service and want to avoid the well-known ranges.
User-Agent Parser breaks a UA string into browser, version, and platform. This is more useful than it sounds: UA strings are deliberately misleading, and reading one by eye reliably produces the wrong answer.
Working locally
All four tools run client-side. Addresses, subnets, and agent strings you paste are not sent anywhere, which matters when they come from your own infrastructure or access logs.
Nothing is stored, so there is no history to clear afterwards.
Frequently asked questions
Are the network tools free?
Yes. All four are free with no account and no usage limit.
Is the IP or user-agent data uploaded?
No. Processing runs in your browser and nothing is transmitted.
Can I parse a subnet range?
Yes. IP Calculator handles the subnet arithmetic for a given address.
Does the UA parser detect bots?
It identifies the browser, version, and platform declared in the string. Well-disguised clients can still misreport.