A google for "japan government official website" turns up http://japan.kantei.go.jp. We can then use the ipinfo.io API to find out which network this is on:
$ curl ipinfo.io/`dig +short japan.kantei.go.jp`
{
"ip": "202.32.211.142",
"hostname": "No Hostname",
"city": null,
"region": null,
"country": "JP",
"loc": "35.6900,139.6900",
"org": "AS2497 Internet Initiative Japan Inc."
}
We can lookup more details at http://ipinfo.io/AS2497. It looks like lots of different organization share this network, including Coca-Cola, and a bunch of universities, so filtering based on this network is going to get us what we're after. You can also go to http://ipinfo.io/countries/jp and see all of the networks in Japan. There are a few that are government related, but there doesn't seem to be a main or single network that the government uses.
I launched http://ipinfo.io back in 2013 and when it hit 50M API requests a day early this year I decided to launch the paid plans, and it's been profitable ever since. It's now hosted across 2 providers in 3 different cities, and handles almost 100M requests per day with a p99 of less than 1s and p50 of less than 100ms. Expect more services and features later this year!
Your product is impressive but I think you can do with this product much more valuable things.
For example, I want to specialize my landing page depends on visitors location. For example I want to change if user comes from US H1 and H2 message. Can you build something makes this possible?
I wrote much of the original BusMapper website and all of the iOS app. The only other person involved (other than Azmat, the CityMapper founder) was Mattias, who did all of the hard core routing algorithms - is he the guy on your team?
I've been on Breue since the start (thanks Zach!), and there have been some great products and some really interesting discussions. It'll be really interesting to see what shape this takes as the community grows!
https://ipinfo.io/pricing?coupon=blackfriday2014