Network Tools
Quick lookups, calculators, and reference tables — no signup, no install. Pick a tool below or bookmark this page for the next time you need a fast answer.
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What Is My IP Address?
Instantly find your public IPv4 address with geolocation details including city, region, country, and ISP.
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MAC Address Vendor Lookup
Enter any MAC address to identify the hardware manufacturer using the IEEE OUI database.
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DNS Record Checker
Query A, AAAA, MX, TXT, CNAME, and NS records for any domain using Google DNS-over-HTTPS.
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Reverse DNS Lookup
Find the hostname (PTR record) associated with any IPv4 address via in-addr.arpa resolution.
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IPv4 Subnet Calculator
Calculate network address, broadcast address, usable host range, and subnet mask from any IP and CIDR prefix.
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IP Address Binary Converter
Convert between dotted-decimal, binary, hexadecimal, and integer IP formats with class and scope detection.
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Common Port Number Reference
Searchable table of well-known TCP/UDP ports — HTTP, SSH, DNS, SMTP, RDP, and more.
Guides That Go With These Tools
Get the background behind what the tools are doing under the hood.
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How to Find Your Public IP Address (And Why It Matters)
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What Is a MAC Address? How to Find and Look Up Yours
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DNS Records Explained: A, AAAA, MX, CNAME, TXT, NS
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What Is Reverse DNS? PTR Records and Email Deliverability
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Subnetting Made Simple: A Beginner’s Guide to CIDR Notation
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IP Address Formats: Decimal, Binary, Hex, and How to Convert
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Common Network Ports: What They Are and What They Do
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Spot an error, run into a tool that isn’t working, or wish we had something we don’t? We’d really appreciate it if you’d drop us a line at hello@networkcheckr.com. Your feedback helps us make these tools better for everyone — thanks for taking the time.