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# ipcalc(1) - Perform simple operations on IP addresses and networks
## SYNOPSIS
**ipcalc** [OPTION]... <IP address>[/prefix] [netmask]
## Description
**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.
## Options
* **-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.
## Examples
### Display all information of an IPv4
$ ipcalc --all-info 193.92.150.2/24
Address: 193.92.150.2
Network: 193.92.150.0/24
Netmask: 255.255.255.0 = 24
Broadcast: 193.92.150.255
Reverse DNS: 150.92.193.in-addr.arpa.
Address space: Internet
Address class: Class C
HostMin: 193.92.150.1
HostMax: 193.92.150.254
Hosts/Net: 254
Country code: GR
Country: Greece
### Display information in key-value format
$ ipcalc -pnmb --minaddr --maxaddr --geoinfo --addrspace 193.92.150.2/255.255.255.224
NETMASK=255.255.255.224
PREFIX=27
BROADCAST=193.92.150.31
NETWORK=193.92.150.0
MINADDR=193.92.150.1
MAXADDR=193.92.150.30
ADDRSPACE="Internet"
COUNTRY="Greece"
### Display all information of an IPv6
$ ipcalc --all-info 2a03:2880:20:4f06:face:b00c:0:14/64
Full Address: 2a03:2880:0020:4f06:face:b00c:0000:0014
Address: 2a03:2880:20:4f06:face:b00c:0:14
Full Network: 2a03:2880:0020:4f06:0000:0000:0000:0000/64
Network: 2a03:2880:20:4f06::/64
Netmask: ffff:ffff:ffff:ffff:: = 64
Reverse DNS: 6.0.f.4.0.2.0.0.0.8.8.2.3.0.a.2.ip6.arpa.
Address space: Global Unicast
HostMin: 2a03:2880:20:4f06::
HostMax: 2a03:2880:20:4f06:ffff:ffff:ffff:ffff
Hosts/Net: 2^(64) = 18446744073709551616
Country code: IE
Country: Ireland
### Display JSON output
$ ipcalc --all-info -j 2a03:2880:20:4f06:face:b00c:0:14/64
{
"FULLADDRESS":"2a03:2880:0020:4f06:face:b00c:0000:0014",
"ADDRESS":"2a03:2880:20:4f06:face:b00c:0:14",
"FULLNETWORK":"2a03:2880:0020:4f06:0000:0000:0000:0000",
"NETWORK":"2a03:2880:20:4f06::",
"NETMASK":"ffff:ffff:ffff:ffff::",
"PREFIX":"64",
"REVERSEDNS":"6.0.f.4.0.2.0.0.0.8.8.2.3.0.a.2.ip6.arpa.",
"ADDRSPACE":"Global Unicast",
"MINADDR":"2a03:2880:20:4f06::",
"MAXADDR":"2a03:2880:20:4f06:ffff:ffff:ffff:ffff",
"ADDRESSES":"18446744073709551616",
"COUNTRYCODE":"IE",
"COUNTRY":"Ireland",
"COORDINATES":"53.000000,-8.000000"
}
### Lookup of a hostname
$ ipcalc --lookup-host localhost --no-decorate
::1
### IPv4 lookup of a hostname
$ ipcalc --lookup-host localhost --no-decorate -4
127.0.0.1
### Reverse lookup of a hostname
$ ipcalc -h 127.0.0.1 --no-decorate
localhost
## Authors
* Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>
* Erik Troan <ewt@redhat.com>
* Preston Brown <pbrown@redhat.com>
* David Cantrell <dcantrell@redhat.com>
## Reporting Bugs
Report bugs at https://gitlab.com/ipcalc/ipcalc/issues
## Copyright
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.
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