Maintaining / Phreaking modems lines using ANAC numbers

I walked into a pile of modems today. Although acessing servers using modems is more secure than telnet they are still holdovers from yesteryear. Nonetheless, my client had one modem for outbound FAX from the server, two more for inbound connections, and one for an unused outbound connection. Somehow, as the years drifted by, we lost track of which modems were for inbound connections and which were outbound. The wires went to jacks on the wall, but these were unmarked. How was I to know what the telephone number was that connected to each modem?

I remembered that I talked to one lineman who had a number he called and an electronic voice would repeat back the telephone number that he had called from. After twenty minutes of googling I found that what I wanted was called an ANAC (Automatic Number Announcement Circuit) number. After a bit more googling I found ttp://text.staticfree.info/anac.txt . The ANAC numbers are also given in http://www.cs.uu.nl/wais/html/na-dir/alt-2600/faq/.html , a very rich collection of information.

I started dialing and soon had the whole mess documented.

Got something to add? Send me email.

2 comments

More Articles by Dirk Hart © 2011-04-30 Dirk Hart

That's great info, Dirk! I use this number, preprogrammed into a Harris headset I keep in my toolbox. It has not let me down yet:

101073217709889664

- Bruce Garlock


815 200-3374 Crystal Lake, IL

815 270-3374 Crystal Lake, IL

815 770-3374 Crystal Lake, IL

815 200-xyz-xyzx La Salle/Rockford, IL

815 290 La Salle/Rockford, IL

Not sure where they came up with these numbers, as they aren't valid.

--BigDumbDinosaur

When I encounter situations like this, I employ the modem to call out to my cell phone which is equipped with caller id.

Roger


I just did a search on the number 101073217709889664 because it is a phone tap detection service. If you call that number from any landline phone, it gives you a number like 8880009880, but the person that gave us this number also had written down the numbers 80000001 next to it, so we dont know if the number 80000001 means you ARE bugged or Aren't. but in any case, thats what the number is for.
Ben G
Kansas






Tue Apr 5 00:50:43 2005: 274   anonymous


Here's a few more ANAC's Most should read back CPN (calling party number)

877-823-2565 (877-TADA-LOL) This ANAC reads back ANI II digits (line class) check out NANPA for more info..

1800-831-8642
1800-444-5555
1800-444-4444
1800-444-3333
1800-444-2222
1800-223-1104 (code : 195632)
1800-314-4258
1800-532-7486 (there is a message before it reads the ANI, so give it a second)
1800-444-0800
1800-552-8355
1800-964-0176
1800-225-5313
1800-225-5214
1800-964-0176
1800-204-4653 (010809 and then number)
1800-877-2278 (009949 and then number)
1800-314-4258
1888-221-0104 (enter any 5 digit number)
1800-789-4479 (201867 and then number)
1800-729-0056 (302234 and then number)

www.phreaksandgeeks.com







Sun Jul 19 15:57:53 2009: 6648   anonymous


so what is this 8880009880 response telling me?

------------------------

---

Printer Friendly Version

Site map     |      Disclaimer

Maintaining / Phreaking modems lines using ANAC numbers Copyright © September 2003 Dirk Hart

Have you tried Searching this site?

Support Rates

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us

Printer Friendly Version