Every developer hits that moment. You’re deep in a network config, debugging a subnet mask, or trying to figure out why a DNS record isn’t resolving—and you reach for a handful of scattered browser tabs and command-line tools just to get the job done. It’s noisy, it’s slow, and half those sites pepper you with ads.
That’s exactly why I keep coming back to ElysiaTools. It’s a free, browser-based toolkit that runs everything client-side. No accounts, no rate limits, no watermarks. Just clean utilities that do the thing and get out of your way.
Today I want to walk through the Network & IP Tools collection—a set of seven utilities I find myself using almost daily when working with networks, APIs, and infrastructure. Whether you’re a backend engineer, DevOps practitioner, or just someone who wants to understand IP addresses better, these tools are worth bookmarking.
1. CIDR Calculator
If you’ve ever stared at 192.168.1.0/24 and needed to know the broadcast address, usable host range, and subnet mask—quickly—this tool is for you. Enter any CIDR notation, IPv4 or IPv6, and it returns the full breakdown: network address, broadcast, subnet mask, wildcard mask, first/last usable IP, and total address count.
What’s useful is the detail. It doesn’t just give you one number—it shows you the complete picture so you can verify the math yourself. Perfect for validating network designs before you push them to production.
2. DNS Query Tool
DNS is one of those layers that, when it breaks, takes down everything else. The DNS Query Tool lets you look up all the common record types—A, AAAA, MX, TXT, NS, CNAME—for any domain, with a single click.
I use this constantly when debugging email delivery issues. Need to verify your MX records are pointing to the right mail server? Run a query. Want to check if your DKIM TXT record propagated? Run a query. The tool gives you TTL values and supports detailed output mode, which is especially helpful when you need to present findings to someone less familiar with DNS.
3. IP Info
Sometimes you just need to know where an IP address is actually coming from. IP Info takes any IPv4 or IPv6 address and returns geolocation, ISP, organization, and even a basic security classification—all powered by the ip-api.com geolocation database.
It automatically classifies IP types too: private, public, loopback, link-local. And if you enable security analysis, you get a simple security score that flags potentially suspicious ranges. Useful when you’re triaging logs and need to quickly contextualize an IP address.
4. Integer to IPv4
Here’s one you don’t need every day—until you do. IPv4 addresses are just 32-bit unsigned integers. Sometimes systems store IPs as integers (database indexes, network cameras, embedded devices), and you need to convert them back to dotted-decimal notation.
The Integer to IPv4 tool handles batch conversion, accepts decimal or hexadecimal input, and can show you binary and hex representations alongside the result. Useful when you’re reverse-engineering a config or parsing logs from a system that stores IPs as integers.
5. IPv4 to Integer
The reverse operation. Drop in one or more IPv4 addresses and get back their integer equivalents. Supports the same batch mode and output options as the tool above, making them a natural pair for round-trip validation.
I find this useful when working with IP range databases or firewall rule sets that use integer ranges instead of CIDR notation. Convert, verify, move on.
6. IPv4 to IPv6
The internet is in a long, slow transition from IPv4 to IPv6. Sometimes you need to represent an IPv4 address in IPv6 format—whether for dual-stack compatibility testing, NAT64 gateways, or just understanding how the two address families interrelate.
The IPv4 to IPv6 tool gives you three formats in one: IPv4-Mapped (::ffff:x.x.x.x), IPv4-Compatible (::x.x.x.x), and NAT64 prefix notation. Pick the format you need and copy it directly.
7. Integer to IPv6
IPv6 addresses are 128-bit integers—vastly larger address space, and correspondingly harder to parse mentally. The Integer to IPv6 tool converts integer values to their full or compressed IPv6 representation.
Handles decimal and hexadecimal input, supports batch conversion, and offers compressed, full, and mixed output formats. If you ever work with IPv6 subnetting or need to convert integer-formatted IPv6 addresses from a database, this is the tool.
Putting It All Together
These seven tools cover a surprising range of real-world networking tasks:
- Planning a subnet? Start with the CIDR Calculator to get your address ranges right.
- Debugging DNS? DNS Query Tool gives you a complete picture of any domain’s records.
- Investigating an IP? IP Info tells you where it’s from and what type it is.
- Working with integer-formatted addresses? Integer ↔ IPv4 and Integer ↔ IPv6 converters handle both directions.
- Building dual-stack compatibility? IPv4 to IPv6 gives you the right format for your use case.
The whole collection is free, runs entirely in your browser, and stores nothing on any server. Worth bookmarking for the next time you need to do network detective work without the overhead.
