---
title: ripcalc
section: 1
header: User Manual
footer: ripcalc 0.1.12
author: Ed Neville (ed-ripcalc@s5h.net)
date: 11 July 2024
---

# NAME

ripcalc - a tool for network addresses

# SYNOPSIS

**ripcalc 127.0.0.1**

**ripcalc -4/--ipv4 127.0.0.1**

**ripcalc -6/--ipv6 ::1**

**ripcalc -f/--format "%a/%c\n" 127.0.0.1**

**ripcalc -m/--mask 28 127.0.0.1**

**ripcalc -c/--csv path/to/csv [-i/--field network] 127.0.0.1**

**ripcalc -l/--list 127.0.0.1**

**ripcalc -a/--available**

**ripcalc -s/--file [-] 127.0.0.1**

**ripcalc -e/--encapsulating [-s/--file name]**

**ripcalc -s/--file name [--inside/--outside] 127.0.0.1**

**ripcalc -b/--base [8, 10, 16 etc]**

**ripcalc -d/--divide [CIDR] 127.0.0.1/24**

**ripcalc -h/--help**


# DESCRIPTION

**ripcalc** can read IPv4/IPv6 addresses from command line or standard input and output different formats or associated networks from **CSV**.

**ripcalc** can format network addresses, find matches in **CSV** or process a list.

**ripcalc** can convert input addresses that are in other number formats such as hex or octal.

Given a list of IP addresses, print only those that match the network. When `s` and `inside` are used, only addresses from `-s` are printed if they are that are inside of the input IP network from the command line. This can be reversed with `--outside`, (e.g. `ripcalc -s - --inside 192.168.0.0/16`).

When `-a` is used, addresses read from `-s` will not be shown when listing `-l` a network, showing only available addresses.

When `--reverse` is used the `inputs`, `sources` or both can be treated as back-to-front.

**ripcalc** can return a list of subnets when a network is provided along with the **divide** argument and a subnet CIDR mask.

When `--encapsulating` is used the containing network will be returned.

# CSV

Network matches can be returned from a **CSV**.

    $ cat nets.csv
    network,range,owner
    rfc1918,192.168.0.0/16,bob
    rfc1918,172.16.0.0/12,cliff
    rfc1918,10.0.0.0/8,mr nobody
    $ ripcalc --csv nets.csv -i range --format '%{owner}\n' 192.168.0.0
    bob

Addresses can be read via file or from stdin (-):

    $ cat list
    127.0.0.1/28
    10.0.0.1/28
    192.168.1.1/30
    172.18.1.1/30
    10.0.0.0/30
    $ ripcalc --csv nets.csv -i range --format '%{range} %{owner}\n' -s list
    10.0.0.0/8 mr nobody
    192.168.0.0/16 bob
    172.16.0.0/12 cliff
    10.0.0.0/8 mr nobody

# FORMAT

**%** denotes a format control character, followed by one of the following:

| placeholder | effect |
|-------------|--------|
| %a          | IP address string |
| %n          | Network address string |
| %s          | Subnet address string |
| %w          | Wildcard address string |
| %b          | Broadcast address string |

Additional characters prefixing the above placeholder can control the representation:

| placeholder | effect |
|-------------|--------|
| %B          | Binary address string |
| %S          | Split binary at network boundary string |
| %l          | Unsigned integer string |
| %L          | Signed integer string |
| %x          | Hex address string |

Other format characters:

| placeholder | effect |
|-------------|--------|
| %c          | CIDR mask |
| %t          | Network size |
| %r          | Network reservation information (if available) |
| %d          | Matching device interface by IP |
| %m          | Matching media link interface by network |
| %k          | RBL-style format |
| %%          | % |
| \n          | Line break |
| \t          | Tab character |

**%xa** gives the address in hex, or **%Sa** to return the binary address, split at the network boundary.

When using **CSV** fields can be matched by **name** when network matched:

    --format '%{name}'

## inside/outside

When `--inside` or `--outside` are given addresses that match `--file` are printed. If no matches are found `ripcalc` will exit non-zero.