AT&T/BOC Routing Codes
The following is a list of routing codes used by AT&T and Bell Operating Companies (BOC) that you can Blue Box to.
Most codes are used by dialing: KP + NPA + XXX + ST
Where XXX is the routing code, except where noted.
There are notes attached after this list.
Codes marked with a ? are unfamiliar to us.
000 - The Rate Quote System (RQS) (1) 001 - 005 Spare (2) 006 - 008 Reserved (3) 009 RQS 010 Reserved 011 International Origination Toll Center (IOTC) (15) 014 TWX Switching Plan (Canada) (?) 015 - 071 Spare 072 - 079 Reserved 080 - 081 Spare 082 - 087 Reserved 088 Spare 089 Reserved 090 - 099 Spare 100 Plant Test - Balance Termination 101 Plant Test - Test Board 102 Plant Test - Milliwatt Tone (1004 Hz) 103 Plant Test - Signaling Test Termination 104 Plant Test - 2-way Transmission and Noise Test 105 Plant Test - Automatic Transmission Measuring System / Remote Office Test Line (ROTL) 106 Plant Test - CCSA Loop Transmission Test 107 Plant Test - Par Meter Generator 108 Plant Test - CCSA Loop Echo Support Maintenance 109 Plant Test - Echo Canceler Test Line 110 - 119 Operator Codes 115 Operator Leave Word 116 Inward DA 120 Network Emergency Center (?) 121 Inward Operator (9) 122 AT&T Ready Line INWATS (4) 123 - 130 Reserved 131 Directory Assistance 132 - 137 Reserved 138 IDDD for Equal Access (7) 139 - 140 Reserved 141 Rate and Route (10) 142 -147 Reserved 148 Points not on an NPA - Hermosillo, Mexico (5) 149 Reserved 150 Cable Control (Satellite Avoidance) - Hawaii (5) 151 International Assistance 152 - 157 Reserved 158 Operator Assistance for Equal Access (7) 160 International Operator Center (IOC) (6) 161 Trunk Trouble Reporting 162 - 167 Reserved 168 Points not on an NPA - Grenada 169 - 170 Reserved 171 Points not on an NPA - Monterey, Mexico 172 Points not on an NPA - Dominican Republic, Puerto Rico, Virgin Islands (Canada only) 173 Reserved 174 Cable Control (Satellite Avoidance) Caribbean 175 Reserved 176 Points not on an NPA - Mexicali, Mexico 177 - 178 Reserved 179 Points not on an NPA - Grenada 180 Points not on an NPA - Mexico Numbers 181 Toll Station 182 International Switching Center (ISC) White Plains, 5 (14) 183 ISC New York, BW24 184 ISC Pittsburgh 185 ISC Atlanta O1T 186 ISC Sacramento 187 ISC Denver/Sherman Oaks (?) (15) 188 ISC New York, 5450 189 Points not on an NPA - Mexico City, Mexico 190 Points not on an NPA - Mexico Numbers 191 Conference Loop Around 191 AT&T Advanced 800 Intercept Recording Frames (4) 192 Reserved 193 Cable Control (Satellite Avoidance) - Grenada 194 Points not on an NPA - Tijuana, Mexico 195 AT&T Advanced 800 (4) 196 AT&T International 800 (4) 197 Reserved 198 AT&T International City Service Center (ICSC) 199 Cable Control (Satellite Avoidance) - Alaska 199 AT&T USA Direct (4)4- or 5-digit codes (8)
Notes
1.) The Rate Quote System is a voice response system used by operators to obtain routing information. The system, now being phased out, was used as an alternative to calling the Rate and Route operator. Operators would key-in required routing information and a synthesized voice would respond. Though the RQS is still operational, operators now obtain routing information from COMPIS (See Note 10).
To place a call to the RQS first dial: KP + NPA + XXX + ST where XXX is the RQS routing code. After a wink (short burst of 2600 Hz), dial in MF one of the following:
KP + 00 + ONPA + NXX + TNPA + NXX + ST To get the rate step for the current time of day.
KP + 01 + ONPA + NXX + TNPA + NXX + ST To get the rate step for a day (8am-5pm) call.
KP + 02 + ONPA + NXX + TNPA + NXX + ST To get the rate step for a evening (5pm-11pm) call.
KP + 03 + ONPA + NXX + TNPA + NXX + ST To get the rate step for a night (11pm-8am) call.
KP + 04 + ? We are not familiar with how to use this feature, it has to do with calls to Mexico.
KP + 05 + NPA + NXX + ST Gives the routing for a Bell Operating Company (BOC) inward operator (see Note 9).
KP + 06 + NPA + NXX + ST Gives the routing for an AT&T inward operator (see Note 9).
KP + 07 + XXXXXXXX + ST Gives a tone check and reads off the numbers you just dialed.
KP + 08 + ? Is used with Enterprise and Zenith numbers. We are not familiar with this function.
KP + 09 + NPA + NXX + ST Gives you the current time for the area code and exchange you dialed.
2.) When a code is marked spare, that means that there is no current or planned network-wide usage. It still may be utilized as a non-standard POTS exchange for WATS service by local companies.
3.) When a code is marked reserved, it means that there may be planned network-wide usage.
4.) This code is used by an AT&T custom service. It may be thought of as acting like a special area code and takes the following dialing format: KP + XXX + YYY + YYYY + ST where XXX is the code in question and Y can be any number 0-9.
5.) All "Points not on an NPA" and "Cable Control" function as pseudo area codes and are followed by a telephone number.
6.) Calls to the IOC are dialed as follows: KP + 160 + CCC + ST where CCC is the Country Code (i.e., 044 or 144 for the U.K.).
For ship calls via Marisat you dial as follows:
- Atlantic: 160 + 871
- Pacific: 160 + 872
- Indian: 160 + 873
7.) These are special codes used with Equal Access. They are as follows: KP + 138 + PIC + ST then KP + CC + YY + XXXXX + ST or KP + 158 + PIC + ST
Where PIC is the Primary Interexchange Carrier code, CC is the Country Code, and YY is City Code. XXXXX is subscriber number. We are not sure exactly when and where these are used.
8.) All 4- and 5-digit codes are dialed as follows: KP + NPA + XXXX + ST or KP + NPA + XXXXX + ST
Keep in mind that not every code is in use in every NPA.
9.) The format for an AT&T inward is usually: KP + NPA + 121 + ST
In some small cities there is an extra code used called a Terminating Toll Center (TTC) or sometimes just a City Code. If a TTC is used, the format is: KP + NPA + TTC + 121 + ST
To get an inward with most BOCs you dial: KP + NPA + 11591 + ST but there are some which use a format of: KP + NPA + TTC + 121 + ST
To get the inward routing for a particular exchange, use the Rate Quote System (RQS).
10.) The number for Rate and Route was: 800 + 141 + 1212 but this was discontinued sometime last year (1987) when the TSPS operators got a computer terminal called COMPIS. In each there is an inward which acts like a Rate and Route operator. In New York it is: 716 + 121
11.) With the advent of ALLIANCE Teleconferencing, use of the conference operator dwindled. There are currently four operator handling conferences. They are as follows:
- Atlanta: 404 + 11511
- Minneapolis: 507 + 11511
- New York: 212 + 11511
- Oakland: 415 + 11511
800-225-0233 translates to the conference operator closest to you.
12.) The Marine Operator is used in calling ships that are close to the United States. There is an operator called the High Seas operator who can be reached by dialing: 800-SEA-CALL (800-732-2255). The High Seas operator is a service of AT&T, while Marisat is an independent company. A High Seas call can go to any ocean for $14.98 for the first 3 minutes and $4.98 for each additional minute. A Marisat only to three oceans and costs $10 a minute.
13.) 116X and 116XX are used to verify an AT&T Calling Card number. You dial: KP + NPA + 116XX + ST when you hear a "bong" you dial the calling card number. If you use 11611 you enter the number in Touch-Tone and if you use 11621 you enter the card number in MF using Key Pulse and Start tones.
14.) These ISC codes are used to provide alternate routing for electro-mechanical switches. Some older electro-mechanical switches, for example #5 Crossbar (5XB) cannot outpulse 011 + CCC (CCC = Country Code) for international dialing. AT&T has set up these special codes to handle international calls. A 5XB can dial: KP + 18X + ST
They would then receive a wink (short blast of 2600 Hz) and would proceed to dial the Country Code and number. If you want to make an international call, you dial: KP + (NPA) + 18X + ST where the NPA is optional. After the wink dial the Country Code, City Code, and number. The "," after the City Code is the switch number if there is more then one 4ESS in that city.
15.) The 187 code was assigned to Atlanta until up to the end of February 1988. AT&T is in the process in routing the calls to the Sherman Oaks Office in California.
16.) To make international calls, dial: KP + 011 + CCC + ST where CCC is the Country Code; and then dial: KP + CC + XXXXXXXX + ST where CC is the City Code and XXXXXXXX is the telephone number.
The USSR has been off direct-dial for many years and due to this fact there is not much information available about its telephone network.
The Country Code for the USSR is 007 and some City Codes are:
- Kiev: 0442
- Leningrad: 812
- Minsk: 172
- Moscow: 095
The only number which can be dialed direct from the U.S. is 007-995-2522457 which is the U.S. embassy in Moscow. All other numbers must be dialed by the Moscow operator. Even the embassy must be dialed by International Operator Center (ICO).
In July 1987, we ran an article ("How Phone Phreaks are Caught") which included the 800 number allocation for long-distance carriers. This is an updated list of the 800 exchanges that route directly to U.S. Sprint:
If you have any interesting numbers, scan sheets, NUAs, or anything similar send to: