Free Network Tools

A suite of browser networking utilities — calculate subnets, geolocate an IP address, resolve DNS records, run an SMTP test, measure round-trip time with a TCP ping, and see your own public IP. No installs, no sign-up, results in milliseconds.

Free

Subnet Calculator

Work out IPv4 and IPv6 subnets from any CIDR — network and broadcast address, host range, mask, wildcard and usable host count.

Open tool Free

IP Address Lookup

Look up and geolocate any IPv4 or IPv6 address — country, city, ASN, ISP, timezone and reverse DNS.

Open tool Free

DNS Lookup & Checker

Resolve any domain's A, AAAA, MX, NS, CNAME, CAA and TXT records in one click, straight from a hosted DNS-over-HTTPS resolver.

Open tool Free

Ping Test Tool

Measure round-trip time to any public host with TCP probes — min, avg, max, standard deviation and packet loss.

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What Is My IP

Instantly see your own public IP address with its location, ISP and timezone — IPv4 or IPv6, detected in your browser.

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SMTP Test

Check a domain's mail setup — MX servers, reverse DNS, SPF, DMARC and DKIM — the DNS records behind reliable email delivery.

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How Network Tools Works

Seven focused utilities, one consistent interface. Pick a tool, paste a value, and read clean output.

1

Pick a tool

Choose the Subnet Calculator for CIDR and subnet math, IP Address Lookup to geolocate an address, DNS Lookup for domain records, the SMTP Test to check mail configuration, the Ping Tool for reachability and latency, or What Is My IP to see your own public address. Each one is a single page with one job. New to subnetting? Start with our guide to what is a subnet.

2

Enter a value and run

Type a domain, IP address, or host, or click one of the example chips to try it instantly. DNS and IP lookups resolve in your browser; the ping runs on a hosted edge worker so it works even when your network blocks raw connections.

3

Read the results

Records, geolocation fields, and per-probe timings are laid out in plain, copyable blocks — no walls of raw output. Nothing is stored, and every tool is rate-limited per IP to stay fast and fair.

Frequently Asked Questions

What are the LK Forge Network Tools?
Network Tools is a free suite of browser-based networking utilities hosted on LK Forge. The tools are a Subnet Calculator for IPv4 and IPv6 subnets and CIDR, an IP Address Lookup that geolocates any IPv4 or IPv6 address with ASN, ISP, timezone and reverse DNS, a DNS Lookup that resolves A, AAAA, MX, NS, CNAME, CAA and TXT records, an SMTP Test that checks a domain's MX, SPF, DMARC and DKIM mail configuration, a Ping Tool that measures TCP round-trip time to any public host, and What Is My IP which shows your own public address. Everything runs in your browser or from a hosted resolver, so you do not need to install dig, nslookup, or any command-line tools.
Are the Network Tools free to use?
Yes. Every tool in the suite is completely free with no sign-up, no account, and no payment. Lookups are rate-limited per IP to keep the hosted resolvers fair for everyone, but there is no usage cap you need to register for. Just open a tool and run a query.
Do these tools run in my browser or on a server?
It depends on the tool. The DNS Lookup and IP Address Lookup run entirely in your browser, calling public DNS-over-HTTPS and geolocation APIs directly. The Ping Tool runs on a hosted edge worker because browsers cannot open raw TCP connections — it opens a TCP socket to the host and port you choose and reports the connect time. No query is stored.
Do I need an account or to install anything?
No. There is nothing to download or install and no account to create. The tools work in any modern browser on desktop or mobile. They are a convenient, hosted alternative to running dig, nslookup, whois, or ping from a terminal, with clean readable output.