Network Tools
ArrayKit's Network tools handle the IP address math that comes up every day in network engineering, DevOps and backend work. Need to plan an address space, size a subnet, or read a firewall rule? The CIDR / Subnet Calculator breaks a CIDR block down into its network address, broadcast address, usable host range and mask, so you can carve up IPv4 space with confidence. The IPv6 ↔ IPv4 Converter translates addresses between IPv4 and IPv6 — mapped, expanded and compressed forms — and pulls out embedded IPv4 from IPv6 notation. These tools are built for sysadmins, cloud engineers and students learning subnetting. Every calculation runs entirely in your browser, so the addresses and ranges you work with are processed locally and nothing is uploaded to a server.
- CIDR / Subnet Calculator — Calculate network, broadcast, host range and mask from a CIDR block.
- IPv6 ↔ IPv4 Converter — Convert between IPv4 and IPv6 (mapped/expanded/compressed) and extract embedded IPv4.
- User Agent Parser — Parse a User-Agent string into browser, engine, operating system and device, in your browser.
- HAR File Viewer — Open a HAR file and inspect the request waterfall, headers, timings and sizes, in your browser.
- IP Range to CIDR — Convert a start and end IP address into the minimal set of CIDR blocks, and back.
- Set-Cookie Parser — Parse Set-Cookie and Cookie headers into a readable table of names, values and attributes.
- IP Address to Integer Converter — Convert an IPv4 or IPv6 address to its integer, hex and binary form, and back.
- MAC Address Generator — Generate random or vendor-prefixed MAC addresses in several formats.
- WiFi QR Code Generator — Create a scannable QR code that joins a WiFi network, with correct escaping.
- Download Time Calculator — Estimate how long a file takes to transfer at a given connection speed.
- DMARC Record Generator — Build and validate a DMARC DNS TXT record with policy, reporting and alignment.
- SPF Record Generator — Build and validate the SPF TXT record that stops others sending mail as your domain.
- Port Number Lookup — What runs on a TCP or UDP port — search by number or service name.
- Data Usage Calculator — Turn streaming, browsing and call habits into monthly gigabytes and cap forecasts.
Frequently asked questions
- What can I do with these Network tools?
- You can calculate subnet details from a CIDR block — network and broadcast addresses, usable host range and subnet mask — and convert addresses between IPv4 and IPv6 in mapped, expanded or compressed form, including extracting embedded IPv4.
- Are these Network tools safe to use with internal IP ranges?
- Yes. Every calculation runs entirely in your browser, so internal CIDR blocks and IP addresses are processed locally and your data never leaves your device. Nothing is uploaded to a server.
- Do the Network tools work offline?
- Yes. Because the subnet math and IP conversions run locally in the browser, they keep working once the page has loaded even if your connection drops.
- Does the CIDR calculator support IPv4 subnetting?
- Yes. Enter a CIDR block such as 10.0.0.0/24 and the calculator returns the network address, broadcast address, host range and mask for that IPv4 subnet.
- Can I convert between IPv4 and IPv6 addresses?
- Yes. The IPv6 ↔ IPv4 Converter translates addresses in both directions, shows mapped, expanded and compressed IPv6 forms, and extracts any IPv4 address embedded in an IPv6 notation.