An online IP range calculator and merger: enter start and end IPs or a CIDR to get the network range, mask, usable host count and address list. It also merges and deduplicates multiple networks—handy for network planning and operations.
Single network
Address list
Merge and deduplicate networks
Accepts a mix of CIDR and a.b.c.d-a.b.c.d ranges; overlapping and adjacent networks are merged automatically and duplicates removed.