Format

Internet Archive

Summary

Name

Internet Archive

Version

1.0

Identifiers

MIME: application/x-internet-archive
PUID: x-fmt/219

Format type

Aggregate

Description

This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’.

File extensions

arc

Source

Digital Preservation Department / The National Archives

Relationships

Has priority over

Is previous version of

Internet Archive 1.1

Internal signatures

Internet Archive 1.0

Note: Version block at beginning of file starts with string “filedesc://” followed by a path and filename whose filename extension is “.arc”<sp>. followed by <ip address>, <date> and “text/plain”<sp> followed by <length><nl> 1<sp>0<sp> followed by “URL IP-address Archive-date Content-type Archive-length”

Byte sequences

Min Frag Length: Absolute from BOF
Offset: 0
Max offset: None
Byte Sequence: 66696C65646573633A2F2F{1-132}20{1-3}2E{1-3}2E{1-3}2E{1-3}20{14}20746578742F706C61696E20{1-16}0A31203020*0A55524C2049502D6164647265737320417263686976652D6461746520436F6E74656E742D7479706520417263686976652D6C656E677468
Endianness: None

Changelog

Updated in V81

Release date

18 February 2015

Internet Archive 1.0: Updated signature. Submitted by National Library of New Zealand.
Updated in V58

Release date

21 March 2012

Internet Archive 1.0: Format name changed for greater accuracy and consistency. Existing signature refined by information provided by Georgia Tech Research Institute, USA.
Updated in V55

Release date

4 January 2012

Alexa Archive File: File signature updated to allow compatability with DROID 5.0 and earlier versions.
Added in V51

Release date

15 July 2011

Alexa Archive File: Signature developed through PRONOM Research.