⚙ Toolbox

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Subnet Calculator

Enter any IPv4 address and CIDR prefix. Instantly get network address, broadcast, host range, usable count, and binary breakdown.

IPv4 CIDR Subnetting Obj 1.4

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Binary / Decimal / Hex Converter

Convert IP addresses and values between binary, decimal, and hexadecimal notation — essential for subnetting and IPv6 study.

Binary Decimal Hex

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Port Number Lookup

Search any port number or protocol name. View TCP/UDP status, associated service, and relevant N10-009 objective.

TCP UDP Ports Obj 1.2

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IPv6 Address Expander

Paste a compressed IPv6 address and see the full 128-bit expanded form, prefix, and address type (link-local, global, multicast).

IPv6 128-bit Obj 1.4

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OSI / TCP-IP Layer Reference

Interactive OSI and TCP/IP model layers. Click any layer to see its protocols, PDU names, devices, and Network+ exam facts.

OSI TCP/IP Obj 1.1

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CIDR Cheat Sheet

Full /0 to /32 reference table — subnet mask, wildcard, total hosts, and usable hosts for every prefix length.

CIDR Reference Subnetting