RE: [PHP] $REMOTE_ADDR subnet consistency?
| From: | Jason Murray | Date: | Sat, 30 Jun 2001 07:30:18 +0000 |
| Subject: | RE: [PHP] $REMOTE_ADDR subnet consistency? | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-55639@lists.php.net to get a copy of this message | ||
> BUT I WAS WONDERING, and now here comes my question, do the first
> two subnets of an IP address (i.e. 204.57.x.x) typically stay the
> same, so that they could be relied upon for general authenticity?
In practice, I would say yes.
However, theoretically, AOL may suddenly use switch your connection
to use a proxy on the other side of the country on a completely
different B class if their proxy gets congested. And if they can
do that within a country (I'm almost sure they do, or can now), they
can do it around the world :)
So in practice yes, in theory and perhaps in practice no.
Jason