IP Addresses


IP addresses are the “phone numbers” for computers connected to networks. There are private IP addresses — which are like internal phone extensions — and external or public IP addresses, which are like regular phone numbers. This is a list of local IP ranges and particular addresses of interest. The Davis Wiki logs and publicly displays the IP addresses of all users. This helps track vandalism and fake accounts. If you wish to remain anonymous, you should not use your RealName and log in from a public internet terminal (see the Privacy section below for more information.)

A full, in-depth technical explanation of IP Addresses can be found [wikipedia]at Wikipedia.

You can [WWW]hover over any username in Recent Changes to display the poster’s IP address in the title tooltip.

The List

Compiled (mostly) in [wikipedia]Classless Inter-Domain Routing format.

Most WiFi hotspots are on SBC DSL lines, the T-Mobile hotspots are the only ones in Davis with static IPs. — Then what are they?

An easy way to determine your IP address over the web to add an entry is to go to [WWW]http://www.whatismyip.com/.

Using the List


Contrary to public belief, publicly posting your IP address carries no more security vulnerability than having your phone number listed in a telephone directory. (In today's security-paranoid world, the phone book could never be created. And with the increasing popularity of mobile phones and VOIP, the phone book as we know it is on its way out.) IP addresses have been the subject of debate on the wiki because their public display could theoretically afford any malicious script kiddies that use the Wiki the opportunity to attack your computer. On the other hand, they provide yet another interesting bit of Davis trivia.

It's generally impossible to determine the location of a given user with any degree of certainty or granularity. For example, someone who lives in Davis may have home DSL on a 'dynamic IP' plan with Sonic.net, which means that they may get an IP address this week that was used by someone in Eureka last week, and will be used by someone in Los Angeles next week. Services from the big megacorps (e.g. ATT, Comcast) give more geographically accurate info in reverse DNS, but even then it's not very close to home - e.g. someone in Davis may show up as being in Sacramento, except when they show up as being in Los Angeles (as they sometimes do.)

Also, many ISPs outsource critical components of their dialup modem service to a company based in San Jose, and due to the way their network is set up anyone using such a dialup service anywhere in the state may appear to be in San Jose.

If you'd like to experiment, [WWW]www.HostIP.info is a free IP address geolocation service. Another relevant source of info is the [WWW]WHOIS records with [WWW]RIRs such as [WWW]ARIN. This page: [WWW]http://www.dnsstuff.com/tools/my-ip-address.ch will show you both geolocation info and WHOIS records for what it perceives to be your IP address.


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[Some time in 2007-01] Using HostIP.info, my current IP address shows as close to home (Oakland) as one can reasonably expect - it says that I'm in San Francisco. That's not true, of course, but it's closer than, say, San Jose or Los Angeles. My mother sent me an email this morning from Eureka, California, so I looked up her IP address on the same hostip.info service - it says that IP address is in Avondale Estates, Georgia. Earlier this afternoon, a friend posted an update to a wiki that logs which IP address each contributor was using at the time. I know this person was in Davis, California when he posted his update and that he wasn't using any VPNs or proxies, and yet his IP address shows up as being in Springfield, Ohio.

This isn't even considering the folks who use such tools as a VPN or proxy server. When I was in China, I used a VPN connection back to the USA, with the end-result that my web browsing appeared to originate from Santa Rosa, California even though I was in Jiangjiajie, Hunan Province. —Graham Freeman

[2007-02-27 19:00:51] ARIN WHOIS is not always the more reliable, it plots SteveO.'s Ip to Sacramento C.C., and occasionally mine to Texas. Just noting, ~DavePoole

2007-02-28 20:45:43   Dave, (1) there's no other RIR besides ARIN that would serve IP blocks in North America, and (2) it's a matter of how things are deployed, not of reliability. e.g. the IP address [WWW] shows up as being in San Francisco, even though equipment that answers on that IP is also deployed in Palo Alto, Washington DC, Seattle, New York City, and London. —GrahamFreeman

2007-02-28 07:43:15   If only we get get IPv6 leases here. —WesHardaker

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