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192.168.0.0 is a /16, it isn't always a /24 in corporate. Most companies I've done work for never have more than 254 devices on a single subnet before being separated by other routers across different floors in the building though, so it's just easier to put their first floor on 192.168.1.0/24, and their second floor on 192.168.2.0/24. Makes it neat and easy to understand.
That said, I've only ever done work for small/medium businesses, I'm sure someone like IBM probably works in giant fucking buildings with huge floorspace, and depending on how their phone lines are done, would require something like a /23 or even larger per floor.
As for why 10.0.0.0/8 never caught on as the standard instead of 192.168.0.0/16; no idea <3
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[–] Heimdallr 0 points 1 point 1 point (+1|-0) ago
192.168.0.0 is a /16, it isn't always a /24 in corporate. Most companies I've done work for never have more than 254 devices on a single subnet before being separated by other routers across different floors in the building though, so it's just easier to put their first floor on 192.168.1.0/24, and their second floor on 192.168.2.0/24. Makes it neat and easy to understand. That said, I've only ever done work for small/medium businesses, I'm sure someone like IBM probably works in giant fucking buildings with huge floorspace, and depending on how their phone lines are done, would require something like a /23 or even larger per floor.
As for why 10.0.0.0/8 never caught on as the standard instead of 192.168.0.0/16; no idea <3