Search notes:

subnet masks

Also known as: netmasks

only 7 possible values for the last octet of a subnet mask: 0, 192, 128, 224, 240, 248 and 252.
dotted decimal formatslash formatavailable addresses
255.255.255.0/24256
255.255.255.128/25128
255.255.255.192/2664
255.255.255.224/2732
255.255.255.240/2816
255.255.255.248/298
255.255.255.252/304

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Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1759612297, '216.73.216.149', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/networking/subnet-masks(33): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78