19May/109
Campfire
by Jeff
Image text: 100 years later, this story remains terrifying--not because it's the local network block, but because the killer is still on IPv4.
This is a take on the classic scary story "The killer was inside the house" or "The call is coming from inside the house". If their IP address is 192.168.xxx.xxx that means they are on your local network since that is the default IP addresses given out by DHCP on a home local network.
The image text references the change over from IPv4 which is IP addresses 192.168.xxx.xxx to IPv6 which look like this: 3ffe:1900:4545:3:200:f8ff:fe21:67cf
May 19th, 2010
It’s worth noting that the 10/24 block, the 192.168/16 block and a /8 block I can’t recall offhand are specifically assigned for use by private internal networks, and aren’t to be routed to the outside world. So it’s not just that 192.168/16 is the default for home routers, it’s that 192.168/16 is always going to be in the house.
May 19th, 2010
The 10 block is /8 actually so anything 10.0.0.0 can be used. The other range is 172.16.0.0 – 172.31.255.255.
May 19th, 2010
Ah, right… I got /8 and /24 confused. Thanks.
May 19th, 2010
To clarify, I confused if the /x referred to network address size or host address size.
May 20th, 2010
The non-routable subnets are actually: 192.168.x/24, 172.16-172.32/16 and 10/8
May 27th, 2010
No they aren’t. The correct ranges are:
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
See RFC1918 for details.
May 21st, 2010
Also one should note that the example IPv6 address given in the post is not routeable either. If you try to lookup that address in whois not even a whois server of 6bone (a shut down IPv6 test network) can be reached – kinda some explanatory irony here.
May 25th, 2010
And I was just marveling at the dramatic side-lighting giving three-dimensionality to a stick figure.
April 21st, 2011
That is so true lol