Network Toolkit

Browser-based tools for network engineers.

Every tool runs entirely in your browser — no sign-up, no data leaves your machine except where a lookup explicitly needs a public registry. Fast, accurate, and built for people who live in CLIs and packet captures.

Addressing & Subnetting

MAC / OUI Resolver

Vendor lookup plus I/G and U/L bit decoding for any MAC or OUI.

CIDR / Subnet Calculator

Network, broadcast, host range, masks, and a bit-boundary view.

IP / Mask Converter

Mask ⇄ CIDR ⇄ wildcard, and IPv4 ⇄ binary / hex / integer.

IP-in-Subnet Check

Test whether an address falls inside a given CIDR block.

Reference

DSCP / ToS Decoder

Map EF, AF, and CS classes to DSCP value, bits, and ToS hex.

Protocol / EtherType / ICMP

Searchable IP protocol numbers, EtherTypes, and ICMP types.

TCP / UDP Port Lookup

Search well-known and registered ports by number or service.

Calculators

Bandwidth / Transfer Time

How long to move X data at Y rate — with bits-vs-bytes clarity.

MTU / MSS Calculator

Derive MSS from MTU with tunnel overhead (GRE, IPsec, VXLAN).

Bandwidth-Delay Product

Optimal TCP window size from bandwidth and RTT.

WPA2 Key / Password Gen

Cryptographically random keys, generated client-side.

Lookups

DNS Lookup

Resolve A, AAAA, MX, TXT, NS, CNAME, SOA over DNS-over-HTTPS.