Much more interesting (from a hacker's perspective) were all the telco services provided using specific exchanges. For any given ILEC there was an exchange used for services provided to customers or employees, including everything from phone testing services and remote terminal access to business customer information and voicemail. By calling these numbers you could find some neat hidden services, and they were free from any phone. You can imagine how bored kids at school with a payphone could discover quite a bit in their spare time.
The DATU was my favorite. It was a secret lineman's number to test circuits, which also enabled you to listen in on live lines. Using these numbers without proper authorization meant jail time, but they had to catch you first :) Ringback was also a fun way to pass the time. Dial the number and hang up, and 30 seconds later the phone would start ringing, and i'd watch who would go answer it. Like I said, bored kids...
When we got the number first, it was not possible to call it from the major mobile networks as they had blacklisted it as a test number!
Callcentric is an "internet phone service", which has been around for at least 8+ years. They allow you to search for unused phone numbers [1] in various area codes [2]. I searched for unused 555 numbers in the following area codes (213, 310, 626, 818) all have some available! So, you could create an account, and for something like $3/month, forward this 555 number to your existing number [3].
[1] http://www.callcentric.com/did_lookup.php?type=check_by_us_n...
The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)Nothing that special about it from a CIDR point of view -- but is rather confusing to us humans when written as a dotted quad.
Github's GITHUB-NET4-1 is on 192.30.252.0/22, which is what reminded me of this.
With 10.x.x.x, the original was class A (/8) but it is extremely unlikely you want that as the netmask. Other guesses could be wrong.
Additionally because of its size, it is likely used in corporate networks. This would cause grief with vpns if both your local network is 10.x.x.x and the corporate vpn is 10.x.x.x.
Haven't used it in a long time (seriously who would when you can search the internet on your smartphone?) but I think it's the same service as 411 minus the $X/min fee (the 800 number version is free, I think the non-800 versions might bill you).
http://stakeholders.ofcom.org.uk/telecoms/numbering/guidance...
I understand that calling a landline is the same thing as call a cell in North America, but it's why there is this mess of incoming minutes vs outgoing minutes allowances and "roaming" charges for leaving a state. Annoying as hell and means you can't get a cheap PAYG sim :(
I suppose a lot depends on your definition of the word 'actual', but there's definitely definitely something there replying on port 80, if nothing else.
http://contactx.test.com/contactX/contact-spam.cfm"Hey Jim, give me a call at 2607 f0d0 1002 0051 0000 0000 0000 0004 when you get a minute" :)