arduino.cc
Mixed
Results vary across arduino.cc: of 6 URLs tested, 2 are disrupted some of the time and 4 load normally. 147 tests have been run under this domain since 2012-05-31, the most recent on 2026-08-05.
The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
The site itself
http://arduino.ccIntermittenthttps://arduino.ccNot blockedhttp://www.arduino.ccNot blockedhttps://www.arduino.ccas of 2026Not blockedPages and subdomains (2)
https://www.arduino.cc/en/Guide/TroubleshootingIntermittenthttps://www.arduino.cc/en/Main/ArduinoBoardProMinias of 2026Not blockedAbout arduino.cc and the Great Firewall
Results vary across arduino.cc: of 6 URLs tested, 2 are disrupted some of the time and 4 load normally. 147 tests have been run under this domain since 2012-05-31, the most recent on 2026-08-05.
Plain HTTP and HTTPS differ here: http://arduino.cc is intermittent, https://arduino.cc is not blocked. The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
Elsewhere on the site
Each URL's status is its verdict over the last 90 days, the same one its own page headlines.