If-Modified-Since

HTTP response header

Header usage statistics

If-Modified-Since response header information and usage statistics.

Websites using header If-Modified-Since 1,831
Percentage of websites that use If-Modified-Since header <0.1%
Total discovered header values 1,422
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

If-Modified-Since detection in the top websites by popularity

Top 10k sites 0 websites
Top 100k sites 6 websites
Top 1m sites 74 websites

Websites utilizing If-Modified-Since

List of websites that use If-Modified-Since header

Domain Country Rank Contacts
www.businesstoday.in United States of America 28,017
www.yachtworld.com United States of America 55,431
i-services.com Canada 63,369
azmvdnow.gov United States of America 89,514
scorepass.com United States of America 92,924
www.scorepass.com United States of America 92,924
See full domain list
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Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common If-Modified-Since header values

Header value Value prevalence
must-revalidate 3.60%
Fri, 11 Jan 2019 18:43:24 +0100 1.86%
Mon, 20 Sep 2021 09:25:24 +0000 1.53%
off 1.31%
0 0.93%
Mon, 26 Jul 1997 05:00:00 GMT 0.82%
304 Not Modified 0.82%
Mon, 22 Jan 2008 00:00:00 GMT 0.76%
Wed, 15 Sept 2021 11:59:15 GMT 0.71%
Sat, 1 Jan 2005 00:00:00 GMT 0.60%
2018-01-01 13:00:00 0.55%
Mon, 06 Dec 2021 00:00:00 GMT 0.44%
Wed, 01 Dec 2021 00:00:00 GMT 0.44%
Fri, 21 Feb 2020 07:28:00 GMT 0.38%
Sat, 01 Jan 2000 00:00:00 GMT 0.38%
Mon, 1 Apr 2019 00:00:00 GMT 0.38%
Mon, 02 Aug 2021 08:51:21 +0000 0.33%
Sun, 07 Nov 2021 00:00:00 GMT 0.33%
Wed, 03 Nov 2021 00:00:00 GMT 0.33%
none 0.27%