424
Area code 424
California, United States
National (424) 555-0123, E.164 +14245550123
How the 475 central office codes (exchanges) of area code 424 were allocated, from the North American Numbering Plan's records: to which carrier, as which line type. A 424 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
- CA
- Exchanges on record
- 475
- Carriers on record
- 19
- Mobile 177 (37%)
- Fixed line 111 (23%)
- VoIP 172 (36%)
- No line type on record 15 (3%)
- 475 exchanges on record
Most exchanges: T-Mobile 97, Onvoy 69, AT&T 64.
Check a number
Valid fixed line or mobile number in the United States.
+1
country code
424
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 | +14245550123 |
| International | +1 424-555-0123 |
| National | (424) 555-0123 |
| RFC 3966 | tel:+1-424-555-0123 |
Source: North American Numbering Plan Administrator (NANPA); Canadian Numbering Administrator (CNAC); National numbering plan: United States (ITU)
The example is 424-555-0123: 555-0100 to 555-0199 are set aside for fictional use in every area code.
The exchange map
One cell per exchange: blocks 424 2xx to 424 9xx; in each block the row is the tens digit, the column the units digit.
- Mobile 177
- Fixed line 111
- VoIP 172
- No line type on record 15
- Not on record 325
Formats and patterns
| E.164 | +14245550123 |
|---|---|
| International | +1 424-555-0123 |
| National | (424) 555-0123 |
| RFC 3966 (tel: URI) | tel:+1-424-555-0123 |
Any 424 number, in E.164
^\+1424[2-9]\d{6}$+1, the area code, a central office code that does not start with 0 or 1, then four digits.
Mobile exchanges (177 on record)
^\+1424(?:2(?:0[0278]|1[02-79]|2[1-57-9]|3[02-7]|4[069]|5[15]|7[38]|8[07]|9[589])|3(?:0[358]|1[026]|2[1349]|3[25]|4[134]|5[068]|6[02469]|7[03469]|8[1-35-7]|9[0-356])|4(?:0[2357-9]|1[023568]|2[0159]|3[5-7]|4[01357-9]|5[0147]|6[237-9]|7[0135]|8[1-3579]|9[47])|5(?:0[3-58]|1[0346]|2[013-57]|3[013-79]|4[5-7]|5[346-8]|7[1-36]|81)|6(?:26|[346]0|75)|7(?:0[23]|31|[7-9]0)|8(?:32|50)|9(?:0[12]|98))\d{4}$Fixed line exchanges (111 on record)
^\+1424(?:2(?:0[13-6]|18|26|3[18]|4[1-578]|5[2-489]|6[7-9]|7[0-257]|8[5689]|9[346])|3(?:[07][12]|1[3-58]|2[027]|3[0478]|4[2578]|5[13-579]|6[37]|8[48]|98)|4(?:01|1[79]|[25][36]|3[349]|4[26]|7[2479]|86|93)|5(?:12|2[268]|38|4[03]|59|6[58]|70)|6(?:10|25|34|4[4-6]|5[23]|78)|7(?:44|50|72|8[59])|835|903)\d{4}$VoIP exchanges (172 on record)
^\+1424(?:2(?:[03]9|20|5[067]|6[0-6]|7[469]|8[1-4]|9[0-27])|3(?:0[04679]|1[79]|2[568]|3[1369]|4[069]|52|6[158]|7[578]|8[09]|9[479])|4(?:0[046]|[14]4|2[2478]|3[0-28]|5[2589]|6[014-6]|7[68]|8[048]|9[0-25689])|5(?:0[0-2679]|1[57-9]|[29]9|32|4[12489]|5[0-2]|6[0-4679]|7[457-9]|8[02-478])|6(?:0[03]|2[24]|55|6[67]|7[27]|88|99)|7(?:04|2[248]|3[28]|5[78]|6[68]|77|8[168]|99)|8(?:00|4[24]|5[57]|6[67]|77|88|99)|9(?:00|4[46]|55|66|77|9[679]))\d{4}$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 424, with the exchanges allocated to it (the three digits after the area code).
| Carrier | Exchanges | Mobile | Fixed line | VoIP | Exchanges held |
|---|---|---|---|---|---|
| T-Mobile | 97 | 97 | 0 | 0 | 207–208, 210, 212–217, 219, 221–224, 228–230, 232–233, 235, 237, 240, 246, 249, 287, 295, 299, 303, 308, 310, 321, 324, 332, 335, 341, 362, 364, 366, 373, 376, 381–382, 385–387, 390–393, 395–396, 403, 407, 413, 415, 420–421, 429, 435–437, 440, 448–449, 454, 457, 462–463, 467–471, 473, 475, 481–483, 485, 489, 510, 513–514, 516, 520–521, 523, 527, 531, 535, 537, 547, 556, 571, 702–703, 901 |
| Onvoy | 69 | 0 | 0 | 69 | 239, 250, 279, 282, 284, 300, 304, 306, 309, 317, 326, 336, 339, 349, 365, 368, 375, 377–378, 380, 400, 452, 476, 484, 488, 490, 492, 495–496, 498, 500–501, 506–507, 509, 529, 548–552, 560–564, 567, 569, 574–575, 578–580, 582–584, 600, 624, 672, 704, 724, 732, 781, 800, 888, 900, 996–997, 999 |
| AT&T | 64 | 36 | 22 | 6 | 225, 236, 263–264, 272, 278, 288, 298, 312, 314–316, 329, 337–338, 343, 350, 356–358, 361, 363, 370, 374, 379, 384, 402, 409, 416, 423, 439, 443, 445–446, 450, 453, 479, 486, 493–494, 503–505, 528, 530, 533–534, 538–541, 545, 553–554, 558, 565, 576, 581, 603, 646, 675, 678, 738, 998 |
| Verizon | 50 | 30 | 20 | 0 | 200, 202–205, 226–227, 234, 245, 248, 251, 253–255, 267, 273, 280, 301, 305, 313, 318, 323, 344, 347, 359–360, 369, 383, 388, 405, 408, 410, 419, 425–426, 441, 447, 451, 487, 497, 508, 536, 557, 559, 572–573, 610, 653, 731, 832 |
| Lumen | 46 | 0 | 42 | 4 | 201, 206, 231, 242–243, 268–271, 275, 277, 285–286, 291–294, 296–297, 320, 322, 328, 330, 334, 342, 345, 348, 351, 354–355, 367, 371–372, 522, 526, 543, 570, 625, 634, 645, 652, 744, 750, 785, 789, 903 |
| Bandwidth.com | 45 | 0 | 0 | 45 | 209, 256–257, 260–262, 265–266, 274, 276, 281, 290, 307, 319, 331, 333, 346, 352, 389, 394, 406, 422, 427–428, 430–431, 438, 444, 458, 460, 464–465, 478, 480, 491, 499, 502, 515, 517–519, 532, 666, 757, 777 |
| Fractel | 33 | 0 | 0 | 33 | 424, 455, 466, 544, 566, 577, 587–588, 599, 622, 655, 667, 677, 688, 699, 722, 758, 766, 786, 788, 799, 842, 844, 855, 857, 866, 877, 899, 944, 946, 955, 966, 977 |
| Emergency Networks | 12 | 12 | 0 | 0 | 524–525, 546, 626, 630, 640, 660, 770, 780, 790, 850, 902 |
| Spectrum | 10 | 0 | 10 | 0 | 247, 302, 353, 398, 433–434, 456, 477, 644, 835 |
| Peerless Network | 8 | 0 | 0 | 8 | 220, 283, 325, 340, 397, 399, 404, 542 |
| Paetec Itel | 7 | 0 | 7 | 0 | 241, 252, 258–259, 442, 512, 568 |
| Tpx Communications | 6 | 0 | 6 | 0 | 218, 244, 289, 417, 472, 474 |
| COMMIO LLC | 3 | 0 | 0 | 3 | 459, 461, 867 |
| Comcast | 3 | 0 | 3 | 0 | 327, 401, 772 |
| Shelltel | 2 | 2 | 0 | 0 | 412, 418 |
| Ton80 Communications | 2 | 0 | 0 | 2 | 728, 768 |
| Frontier | 1 | 0 | 1 | 0 | 238 |
| TELNYX | 1 | 0 | 0 | 1 | 414 |
| Voip Street | 1 | 0 | 0 | 1 | 432 |
Questions developers ask
- Where is area code 424?
- Area code 424 is in California, in the United States: all 475 of its exchanges on record are there. From abroad it is dialled +1 424, then the seven-digit number.
- Is a 424 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 475 exchanges on record in 424, 177 (37%) were allocated as mobile, 111 (23%) as fixed line, 172 (36%) as VoIP and 15 (3%) 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 424?
- 19 carriers hold exchanges in 424 on record; the most: T-Mobile (97), Onvoy (69) and AT&T (64). 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 424 phone number?
- In E.164 a 424 number matches ^\+1424[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 (424) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP.