1 IPv4 Calculator

Address with prefix or subnet mask

Accepts 10.0.0.1/22, 10.0.0.1 255.255.252.0, 10.0.0.1/255.255.252.0, wildcard masks and pasted surrounding text.

2 VLSM Planner

Starting block

Requirements - name: hosts, one per line

Use /31 for point-to-point links (RFC 3021)

Subnets or ranges, one per line

start - end ranges are accepted too.

Starting network

Target prefix

Subnets to summarize, one per line

Two results: smallest containing prefix and exact aggregate set.

MAC address in any format, one per line

Recognises the Cisco, Juniper, Fortinet, HPE, Huawei, Windows and Linux formats, surrounding text included.