--range

Retrieve a byte range (i.e. a partial document) from an HTTP/1.1, FTP or SFTP server or a local FILE. Ranges can be specified in a number of ways.

0-499

specifies the first 500 bytes

500-999

specifies the second 500 bytes

-500

specifies the last 500 bytes

9500-

specifies the bytes from offset 9500 and forward

0-0,-1

specifies the first and last byte only(*)(HTTP)

100-199,500-599

specifies two separate 100-byte ranges(*) (HTTP)

(*) = NOTE that if specifying multiple ranges and the server supports it then it replies with a multiple part response that curl returns as-is. It contains meta information in addition to the requested bytes. Parsing or otherwise transforming this response is the responsibility of the caller.

Only digit characters (0-9) are valid in the 'start' and 'stop' fields of the 'start-stop' range syntax. If a non-digit character is given in the range, the server's response is unspecified, depending on the server's configuration.

Many HTTP/1.1 servers do not have this feature enabled, so that when you attempt to get a range, curl instead gets the whole document.

FTP and SFTP range downloads only support the simple 'start-stop' syntax (optionally with one of the numbers omitted). FTP use depends on the extended FTP command SIZE.

When using this option for HTTP uploads using POST or PUT, functionality is not guaranteed. The HTTP protocol has no standard interoperable resume upload and curl uses a set of headers for this purpose that once proved working for some servers and have been left for those who find that useful.

This command line option is mutually exclusive with --continue-at: you can only use one of them for a single transfer.