This is a CodeMirror mode that provides syntax highlighting for IP addresses. It supports regular addresses, CIDR notations and ranges for both IPv4 and IPv6. Dual addresses are also supported.

Load ipaddr.js at an adequate location in your HTML structure. Mention mode: 'ipaddr' when creating your CodeMirror instance or, better, mode: 'text/x-ip-address'.

Whether or not to recognize CIDR notations and IP ranges can be set using the following boolean options: ipv4_cidr, ipv6_cidr, ipv4_ranges, ipv6_ranges. By default, codemirror-mode-ipaddr highlights only the first part of the first line and marks everything else as erroneous. This is called strict mode and it can be disabled through strict: false. Refer to the demo page for further explanations.

This mode leverages CodeMirror's default tokens (number, punctuation, meta, attribute and error) and should therefore fit in with all CodeMirror themes.

codemirror-mode-ipaddr was designed to be nested within another mode, i.e. to highlight IP addresses for another mode (of course, this requires adjusting the other mode). This is why strict mode is enabled by default. It may also be used to highlight IP addresses in single-line CodeMirror input fields.

This mode is released under the 3-clause BSD license.