Network Calc

Summarise IPv4 or IPv6 CIDR blocks into the minimal set (merging adjacent and overlapping blocks) plus the covering supernet.

Compare two IPv4 or IPv6 CIDR blocks: equal, contains, contained, adjacent or disjoint, their common supernet, and test an IP.

IPv6 prefix calculator: first and last address, size, number of /64s, the nth subnet, address type and reverse DNS zone.

Ethernet wire overhead, TCP/UDP goodput and maximum packets per second at line rate for a packet size and link speed.

Convert an IPv4 or IPv6 address between notations: RFC 5952 compressed, expanded, integer, hex, binary, reverse DNS, NAT64.

TCP MSS from an MTU for IPv4 or IPv6, effective MTU through tunnels (PPPoE, GRE, VXLAN, WireGuard) and IPv4 fragment counts.

Convert an IPv4 prefix length, netmask, wildcard or hex mask into every other form with host counts; flags bad masks.

Propagation delay (one way and round trip) over fibre, copper or radio for a distance or two coordinates, plus serialization.

Split an IPv4 network into equal subnets, or allocate VLSM subnets from host counts (largest first) with ranges and leftovers.

TCP bandwidth-delay product, window size and scale factor needed, throughput limits from window and from packet loss (Mathis).

Time to transfer a file at a bandwidth (with protocol overhead), or the bandwidth or data size implied by the other two.

Bandwidth of a VoIP call (IP and Ethernet level) for a codec and packetization time, and totals for many calls.