ipcalc - Man Page

• Show information about an address or network with a given subnet mask: ipcalc 1.2.3.4 255.255.255.0
• Show information about an address or network in CIDR notation: ipcalc 1.2.3.4/24
• Show the broadcast address of an address or network: ipcalc -b 1.2.3.4/30
• Show the network address of provided IP address and netmask: ipcalc -n 1.2.3.4/24
• Display geographic information about a given IP address: ipcalc -g 1.2.3.4

tldr.sh

ipcalc [OPTION]... IP address[/prefix] [netmask]

ipcalc provides a simple way to calculate IP information for a host or network. Depending on the options specified, it may be used to provide IP network information in human readable format, in a format suitable for parsing in scripts, generate random private addresses, resolve an IP address, or check the validity of an address.

By default or when the --info or --all-info parameters are specified the information provided is free form and human readable. Otherwise the output is JSON formatted when -j is specified, or when specific options are given (e.g., --prefix) the output is in the VAR=VALUE format.

The various options specify what information ipcalc should display on standard output. Multiple options may be specified. It is required to specify an IP address; several operations require a netmask or a CIDR prefix as well.

• -c, --check Validate the IP address under the specified family.
• -i, --info Display generic information on the provided network in human readable format. This is the default option if no other options are provided.
• --all-info Display verbose information on the provided network and addresses in human readable format. That includes GeoIP information.
• -S, --split Split the provided network using the specified prefix or netmask. That is, split up the network into smaller chunks of a specified prefix. When combined with no-decorate mode (--no-decorate), the split networks will be printed in raw form. Example "ipcalc -S 26 192.168.1.0/24".
• -d, --deaggregate Deaggregates the provided address range. That is, print the networks that cover the range. The range is given using the '-' separator, e.g., "192.168.1.3-192.168.1.23". When combined with no-decorate mode (--no-decorate), the networks are printed in raw form.
• -r, --random-private Generate a random private address using the supplied prefix or mask. By default it displays output in human readable format, but may be combined with other options (e.g., --network) to display specific information in VAR=VALUE format.
• -h, --hostname Display the hostname for the given IP address. The variable exposed is HOSTNAME.
• -o, --lookup-host Display the IP address for the given hostname. The variable exposed is ADDRESS.
• -4, --ipv4 Explicitly specify the IPv4 address family.
• -6, --ipv6 Explicitly specify the IPv6 address family.
• -b, --broadcast Display the broadcast address for the given IP address and netmask. The variable exposed is BROADCAST (if available).
• -a, --address Display the IP address for the given input. The variable exposed is ADDRESS (if available).
• -g, --geoinfo Display geographic information for the given IP address. This option requires libGeoIP/libmaxminddb to be available. The variables exposed are COUNTRYCODE, COUNTRY, CITY and COORDINATES (when available).
• -m, --netmask Calculate the netmask for the given IP address. If no mask or prefix is provided, in IPv6 a 128-bit mask is assumed, while in IPv4 it assumes that the IP address is in a complete class A, B, or C network. Note, however, that many networks no longer use the default netmasks in IPv4. The variable exposed is NETMASK.
• -p, --prefix Show the prefix for the given mask/IP address. The variable exposed is PREFIX.
• --class-prefix Assign the netmask of the provided IPv4 address based on the address class. This was the default in previous versions of this software.
• -n, --network Display the network address for the given IP address and netmask. The variable exposed is NETWORK.
• --reverse-dns Display the reverse DNS for the given IP address and netmask. The variable exposed is REVERSEDNS.
• --minaddr Display the minimum host address in the provided network. The variable exposed is MINADDR.
• --maxaddr Display the maximum host address in the provided network. The variable exposed is MAXADDR.
• --addresses Display the number of host addresses in the provided network. The variable exposed is ADDRESSES.
• --addrspace Display address space allocation information for the provided network. The variable exposed is ADDRSPACE.
• --no-decorate Print only the requested information. That when combined with split networks option, will only print the networks without any additions for readability.
• -j, --json When used with -i or -S, print the info as a JSON object instead of the usual output format.
• -s, --silent Don't ever display error messages.

• Nikos Mavrogiannopoulos n.mavrogiannopoulos@gmail.com
• Erik Troan ewt@redhat.com
• Preston Brown pbrown@redhat.com
• David Cantrell dcantrell@redhat.com

Report bugs at https://gitlab.com/ipcalc/ipcalc/issues

Copyright © 1997-2020 Red Hat, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.