423
Area code 423
Tennessee, United States
National (423) 555-0123, E.164 +14235550123
How the 779 central office codes (exchanges) of area code 423 were allocated, from the North American Numbering Plan's records: to which carrier, as which line type. A 423 number is mobile, fixed line or VoIP according to its exchange, the three digits after the area code; the allocation is the original one (below).
At a glance
- Country code
- +1
- State
- TN
- Exchanges on record
- 779
- Carriers on record
- 43
- Mobile 265 (34%)
- Fixed line 353 (45%)
- VoIP 147 (19%)
- No line type on record 14 (2%)
- 779 exchanges on record
Most exchanges: AT&T 216, Lumen 129, Verizon 84.
Check a number
Valid fixed line or mobile number in the United States.
+1
country code
423
area code
5550123
subscriber number
| Country | United States numbering plan |
|---|---|
| Line type | Fixed line or mobile |
| Carrier the block was allocated to | No carrier on record for this prefix |
| E.164 | +14235550123 |
| International | +1 423-555-0123 |
| National | (423) 555-0123 |
| RFC 3966 | tel:+1-423-555-0123 |
Source: North American Numbering Plan Administrator (NANPA); Canadian Numbering Administrator (CNAC); National numbering plan: United States (ITU)
The example is 423-555-0123: 555-0100 to 555-0199 are set aside for fictional use in every area code.
The exchange map
One cell per exchange: blocks 423 2xx to 423 9xx; in each block the row is the tens digit, the column the units digit.
- Mobile 265
- Fixed line 353
- VoIP 147
- No line type on record 14
- Not on record 21
Formats and patterns
| E.164 | +14235550123 |
|---|---|
| International | +1 423-555-0123 |
| National | (423) 555-0123 |
| RFC 3966 (tel: URI) | tel:+1-423-555-0123 |
Any 423 number, in E.164
^\+1423[2-9]\d{6}$+1, the area code, a central office code that does not start with 0 or 1, then four digits.
Mobile exchanges (265 on record)
^\+1423(?:2(?:0[38]|1[03-5]|2[1-37]|3[137]|4[018]|5[1589]|6[089]|7[01367]|8[0459]|9[0-3])|3(?:0[0469]|1[02-6]|2[0279]|3[0135]|4[0-2]|5[568]|6[0-46-8]|7[17]|8[1347-9]|9[458])|4(?:0[0459]|1[235689]|2[169]|3[02]|4[0148]|5[78]|6[4-69]|7[015]|8[03689]|9[47])|5(?:0[2-6]|1[2489]|2[134]|3[049]|44|5[27]|6[47]|7[1267]|8[0489]|9[235689])|6(?:0[257-9]|1[27-9]|2[01]|3[57]|4[4-7]|5[03-6]|6[17]|7[67]|8[0-357]|9[4-69])|7(?:0[146-8]|1[578]|2[16]|3[26-8]|4[0-27-9]|54|6[027]|7[346]|9[125-7])|8(?:0[0-27]|1[367]|2[39]|3[3568]|4[159]|56|6[34]|71|89|9[058])|9(?:0[2-59]|1[248]|2[03]|4[368]|5[167]|6[379]|72|87|9[1469]))\d{4}$Fixed line exchanges (353 on record)
^\+1423(?:2(?:0[0-24679]|1[26-9]|2[0489]|3[024-689]|4[2-79]|5[02-467]|6[1-35-7]|7[24589]|8[1-36-8]|9[4-9])|3(?:0[1378]|1[7-9]|2[13-6]|3[246-9]|4[3-689]|5[1-479]|6[59]|7[28]|8[56]|9[0-36])|4(?:0[178]|1[047]|2[02-58]|3[13-9]|4[2379]|5[1-59]|6[1-37]|7[2-46-9]|8[2457]|9[0235689])|5(?:0[178]|1[0367]|2[02569]|3[1-35-8]|4[235-8]|5[349]|6[23689]|7[03-589]|8[125-7])|6(?:01|1[034]|2[2-9]|3[0-24689]|4[02389]|5[289]|6[3-58]|73|9[2378])|7(?:0[29]|1[46]|2[2-57-9]|3[1359]|4[3-6]|5[1-35-8]|6[13-58]|7[2589]|8[0-57-9]|9[03489])|8(?:0[39]|1[09]|2[125-7]|3[1479]|4[2-467]|5[12457]|6[79]|7[04-8]|8[1-467]|9[2-4679])|9(?:07|1[357]|2[1689]|3[0389]|4[2459]|5[2-4]|6[158]|7[3589]|8[19]|90))\d{4}$VoIP exchanges (147 on record)
^\+1423(?:2(?:05|2[56]|64)|3(?:0[25]|28|47|50|7[03-69]|8[02]|9[79])|4(?:0[236]|27|4[56]|5[06]|6[08]|[89]1)|5(?:0[09]|15|2[78]|4[019]|5[0168]|6[015]|83|9[0147])|6(?:0[0346]|1[56]|33|41|5[17]|6[0269]|7[0-24589]|8[4689]|9[01])|7(?:0[35]|1[0239]|20|3[04]|5[09]|6[69]|7[017]|86)|8(?:0[4-68]|1[2458]|2[04]|3[02]|4[08]|5[0389]|6[0268]|7[239]|8[058])|9(?:0[068]|1[09]|2[2457]|3[246]|4[01]|55|6[06]|77|80|9[23578]))\d{4}$The exchange patterns follow the original allocations; a number ported since keeps its digits but not necessarily its carrier or its line type.
Carriers and their exchanges
Every carrier holding exchanges in 423, with the exchanges allocated to it (the three digits after the area code).
| Carrier | Exchanges | Mobile | Fixed line | VoIP | Exchanges held |
|---|---|---|---|---|---|
| AT&T | 216 | 80 | 132 | 4 | 204, 208–209, 219, 222–223, 231, 235, 237, 242–244, 249, 258, 263, 265–268, 272, 276, 284–285, 287, 296, 298, 304, 310, 315, 317–318, 320–321, 326, 329–330, 332, 334, 336–339, 342, 344–345, 351, 355–356, 362, 364–367, 375, 386–387, 394, 404, 408, 420, 425, 429, 442, 445, 448, 451–452, 458–459, 463, 465, 471–473, 476, 478–479, 485, 487–490, 492–493, 495–496, 499, 507–508, 510, 513, 517, 522, 539, 553, 559, 562–563, 566–567, 570, 576–577, 580–582, 584–587, 589, 596, 598, 601, 603, 613–614, 622–625, 629, 634–635, 640, 642, 644–645, 649, 653, 658–659, 668, 683, 685, 687, 695, 697–698, 704, 706–707, 728, 733, 737–738, 741, 744–748, 751–752, 755–757, 760, 763, 767, 771, 774–776, 778, 780, 784–785, 800, 807, 810, 816, 821–822, 825, 827, 829, 835, 837–838, 842–843, 846–847, 849, 855, 867, 869–871, 874–877, 882–883, 886, 890, 892–894, 899, 902–903, 907, 912, 918, 920–921, 923, 942, 954, 961, 987, 991, 994 |
| Lumen | 129 | 0 | 127 | 2 | 200–201, 207, 212, 217–218, 224, 229–230, 232, 234, 236, 238–239, 245–247, 256–257, 262, 274, 278–279, 282–283, 288, 294, 297, 299, 323, 325, 343, 348–349, 354, 357, 359, 372, 378, 390–392, 396, 410, 422, 431, 433–439, 443, 453–455, 461, 467, 474, 477, 482, 484, 491, 516, 525–526, 538, 542–543, 545–547, 551, 578, 610, 626, 636, 638–639, 652, 664–665, 693, 702, 722–723, 725, 727, 735, 743, 753, 761, 764, 768, 772, 781, 783, 787–789, 793, 798–799, 809, 834, 844, 851–852, 854, 857, 878, 896–897, 913, 915, 917, 926, 928–929, 938, 952–953, 968, 973, 975, 979, 989–990 |
| Verizon | 84 | 80 | 4 | 0 | 202, 215, 240–241, 260, 269–271, 280, 290, 300–301, 306, 309, 312, 322, 327, 335, 341, 360–361, 368, 389, 413, 415–419, 426, 440, 444, 457, 470, 480, 483, 486, 494, 502, 506, 512, 523, 534–535, 552, 564, 571, 588, 599, 605, 607–609, 612, 618–621, 637, 650, 661, 667, 680–682, 699, 715, 718, 726, 732, 736, 740, 742, 754, 762, 797, 802, 813, 836, 845, 863, 914, 956, 969 |
| T-Mobile | 73 | 73 | 0 | 0 | 213, 227, 251, 255, 273, 277, 289, 291–293, 313–314, 316, 331, 333, 340, 358, 371, 381, 383–384, 388, 395, 398, 400, 405, 421, 432, 441, 464, 466, 475, 497, 503–505, 518, 521, 530, 544, 557, 593, 595, 617, 646–647, 676–677, 694, 696, 708, 717, 749, 773, 791, 817, 823, 833, 841, 856, 889, 895, 898, 943, 946, 948, 951, 957, 963, 967, 972, 996, 999 |
| Sinch (Inteliquent) | 54 | 0 | 0 | 54 | 205, 370, 373–374, 376, 379, 382, 427, 468, 500, 509, 515, 540, 558, 560–561, 591, 594, 604, 616, 662, 666, 669, 674–675, 678–679, 686, 691, 703, 734, 759, 766, 770, 777, 786, 805, 818, 820, 824, 830, 840, 850, 858–859, 862, 868, 879–880, 885, 888, 900, 919, 980 |
| Paetec Itel | 33 | 0 | 33 | 0 | 216, 220, 228, 252, 254, 275, 303, 307–308, 352–353, 385, 401, 424, 428, 449, 520, 529, 532, 536–537, 673, 709, 714, 716, 724, 758, 779, 782, 794, 826, 933, 939 |
| Bandwidth.com | 30 | 0 | 0 | 30 | 225–226, 302, 347, 380, 397, 399, 402–403, 446, 460, 481, 528, 550, 556, 565, 583, 590, 597, 641, 657, 684, 689, 712, 720, 769, 804, 806, 812, 997 |
| Comcast | 17 | 0 | 0 | 17 | 264, 305, 328, 406, 450, 600, 606, 615, 710, 713, 730, 808, 815, 866, 910, 936, 941 |
| UScellular | 12 | 12 | 0 | 0 | 210, 214, 248, 259, 363, 377, 519, 572, 592, 701, 721, 801 |
| Highland Telephone Cooperative | 10 | 0 | 10 | 0 | 286, 319, 324, 346, 369, 569, 627–628, 663, 965 |
| Spectrum | 10 | 0 | 10 | 0 | 281, 393, 423, 631, 729, 731, 765, 790, 839, 945 |
| TDS Telecom | 7 | 0 | 7 | 0 | 253, 261, 295, 462, 568, 884, 887 |
| TELNYX | 7 | 0 | 0 | 7 | 456, 633, 651, 672, 688, 690, 814 |
| USA Mobility | 7 | 7 | 0 | 0 | 221, 409, 412, 469, 514, 655, 795 |
| COMMIO LLC | 6 | 0 | 0 | 6 | 350, 527, 860, 908, 940, 998 |
| EPB Telecommunications | 6 | 0 | 6 | 0 | 206, 498, 531, 643, 648, 803 |
| Bledsoe Telephone Cooperative | 5 | 0 | 5 | 0 | 447, 533, 554, 881, 949 |
| Brightlink Communications | 5 | 3 | 0 | 2 | 430, 524, 602, 705, 719 |
| Fractel | 5 | 0 | 0 | 5 | 873, 922, 955, 966, 977 |
| Ton80 Communications | 5 | 0 | 0 | 5 | 832, 925, 927, 932, 934 |
| Emergency Networks | 4 | 4 | 0 | 0 | 864, 904–905, 909 |
| BTES | 3 | 0 | 3 | 0 | 573–575 |
| Dish Wireless | 3 | 3 | 0 | 0 | 203, 792, 796 |
| TWIN LAKES COMMUNICATIONS | 3 | 0 | 3 | 0 | 250, 407, 632 |
| CSC Wireless LLC | 2 | 2 | 0 | 0 | 654, 656 |
| HD Carrier | 2 | 0 | 0 | 2 | 993, 995 |
| IP Horizon | 2 | 0 | 0 | 2 | 670–671 |
| Mountainet Telephone Company | 2 | 0 | 2 | 0 | 579, 930 |
| Nuso | 2 | 0 | 2 | 0 | 819, 831 |
| Peerless Network | 2 | 0 | 0 | 2 | 924, 960 |
| Skybest Communications | 2 | 0 | 2 | 0 | 501, 692 |
| Skyetel | 2 | 0 | 0 | 2 | 750, 848 |
| Terra Nova Telecom | 2 | 0 | 0 | 2 | 872, 992 |
| Twilio International | 2 | 0 | 0 | 2 | 660, 853 |
| Vonage | 2 | 0 | 0 | 2 | 541, 549 |
| Wavenation | 2 | 0 | 2 | 0 | 978, 981 |
| Callworks Corporation | 1 | 0 | 0 | 1 | 906 |
| ETC Communications | 1 | 0 | 1 | 0 | 548 |
| PEACE COMMUNICATIONS | 1 | 0 | 1 | 0 | 414 |
| Pro Page Partners | 1 | 1 | 0 | 0 | 233 |
| Scott County Telephone Cooperative | 1 | 0 | 1 | 0 | 944 |
| Skyline Telephone Membership Corporation | 1 | 0 | 1 | 0 | 739 |
| Telescan | 1 | 0 | 1 | 0 | 630 |
Questions developers ask
- Where is area code 423?
- Area code 423 is in Tennessee, in the United States: all 779 of its exchanges on record are there. From abroad it is dialled +1 423, then the seven-digit number.
- Is a 423 number mobile or landline?
- Either: in the North American Numbering Plan the line type belongs to the exchange (the three digits after the area code), not to the area code. Of the 779 exchanges on record in 423, 265 (34%) were allocated as mobile, 353 (45%) as fixed line, 147 (19%) as VoIP and 14 (2%) have no line type on record. A number can have been ported since, to another carrier and even to another line type.
- Which carriers have numbers in area code 423?
- 43 carriers hold exchanges in 423 on record; the most: AT&T (216), Lumen (129) and Verizon (84). These are the original allocations: with number portability, a number may be served by another carrier today, which only a live carrier lookup (an HLR or MNP query) can tell.
- How do I validate a 423 phone number?
- In E.164 a 423 number matches ^\+1423[2-9]\d{6}$: +1, the area code, a central office code that does not start with 0 or 1, then four digits. Written nationally it reads (423) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP.