{ "url": "https://phonelookup.dev/prefix/us-858", "npa": "858", "slug": "us-858", "iso": "US", "country": "United States", "regions": [ { "code": "CA", "name": "California", "exchanges": 577 } ], "exchanges": 577, "known": 563, "byLineType": { "fixed_line": 322, "mobile": 136, "unknown": 14, "voip": 105 }, "carriers": [ { "name": "AT&T", "exchanges": 236, "byLineType": { "fixed_line": 183, "mobile": 50, "voip": 3 }, "ranges": [ "202", "207–208", "215", "230", "232", "238", "242", "249", "255", "259", "265–266", "268–274", "276–280", "282", "289", "291–292", "295", "298", "304", "307", "314–316", "320", "324", "328", "334–337", "340", "342–344", "349–350", "353", "360–361", "369–370", "372", "374", "381–383", "385", "390–391", "396", "401–404", "406", "409", "416–418", "420–421", "431", "437", "439–440", "448", "450–459", "467", "481", "483–488", "490", "492", "495–496", "499", "502–503", "505", "509", "513–514", "521–527", "530–531", "534–539", "541", "546–547", "549–552", "554", "558", "560", "565–566", "568–571", "573", "576–578", "581", "586–587", "592", "597–598", "603", "613–614", "616", "618", "621–623", "625–627", "633", "635–638", "642–643", "646", "650", "653–655", "657–658", "668", "672–679", "684", "689", "693–695", "699", "705", "715", "720", "722", "729", "740", "748", "755–756", "759", "765", "771", "774", "780", "784", "790", "792–795", "810", "812", "822", "824", "826", "831", "837", "847–848", "874", "886", "909", "924", "939", "942", "966", "974", "978–986", "989" ] }, { "name": "Verizon", "exchanges": 64, "byLineType": { "fixed_line": 33, "mobile": 31 }, "ranges": [ "204", "210", "226–229", "243–245", "248", "253", "275", "287–288", "322", "331", "339", "348", "352", "354", "362", "366", "373", "378", "395", "408", "410", "414", "423", "430", "434", "442", "449", "471–472", "609", "692", "703–704", "712", "716", "724", "726", "731", "735", "737", "750", "753", "761", "775", "799", "836", "859", "877", "879–880", "901", "905", "922", "926", "935", "945–946", "997" ] }, { "name": "T-Mobile", "exchanges": 45, "byLineType": { "mobile": 45 }, "ranges": [ "205", "209", "212–214", "220", "231", "241", "252", "254", "260–262", "267", "290", "305", "308", "313", "319", "330", "341", "389", "405", "407", "415", "443", "445", "504", "518", "583", "602", "610", "652", "663", "682", "688", "717", "733", "752", "776", "829", "864", "883", "902", "967" ] }, { "name": "Lumen", "exchanges": 38, "byLineType": { "fixed_line": 38 }, "ranges": [ "201", "240", "246", "257–258", "281", "309", "323", "332", "346", "357", "375", "380", "386", "429", "461", "465", "480", "617", "649", "651", "736", "746", "754", "762", "779", "798", "805", "834", "845", "863", "876", "882", "914", "925", "943", "951–952" ] }, { "name": "Fractel", "exchanges": 35, "byLineType": { "voip": 35 }, "ranges": [ "355", "377", "388", "399", "422", "466", "477", "533", "544", "567", "585", "588", "599", "644", "667", "744", "758", "786", "788–789", "808", "828", "833", "838", "844", "855", "867", "878", "898–899", "933", "944", "955", "977", "988" ] }, { "name": "Onvoy", "exchanges": 34, "byLineType": { "voip": 34 }, "ranges": [ "203", "206", "221–224", "239", "264", "283", "338", "358", "365", "387", "398", "424", "426", "438", "441", "447", "460", "464", "468–469", "500", "529", "666", "732", "757", "766", "900", "910", "927", "987", "999" ] }, { "name": "Tpx Communications", "exchanges": 24, "byLineType": { "fixed_line": 24 }, "ranges": [ "200", "216–218", "293", "300", "318", "356", "376", "400", "413", "432", "436", "444", "519", "564", "707", "713", "751", "777", "860", "866", "869", "875" ] }, { "name": "Comcast", "exchanges": 14, "byLineType": { "fixed_line": 14 }, "ranges": [ "256", "285", "296", "299", "302–303", "312", "345", "371", "397", "634", "768", "832", "842" ] }, { "name": "Pac-West Telecomm", "exchanges": 9, "byLineType": { "fixed_line": 9 }, "ranges": [ "225", "428", "630", "683", "769", "815", "923", "947", "956" ] }, { "name": "Bandwidth.com", "exchanges": 8, "byLineType": { "voip": 8 }, "ranges": [ "284", "294", "326", "329", "333", "379", "800", "888" ] }, { "name": "Paetec Itel", "exchanges": 8, "byLineType": { "fixed_line": 8 }, "ranges": [ "235", "321", "427", "433", "435", "605", "764", "964" ] }, { "name": "Ton80 Communications", "exchanges": 7, "byLineType": { "voip": 7 }, "ranges": [ "462–463", "665", "687", "727", "742", "787" ] }, { "name": "North County Communications", "exchanges": 6, "byLineType": { "fixed_line": 6 }, "ranges": [ "233–234", "236–237", "297", "364" ] }, { "name": "COMMIO LLC", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "317", "363", "392–393" ] }, { "name": "American Messaging", "exchanges": 3, "byLineType": { "mobile": 3 }, "ranges": [ "359", "493–494" ] }, { "name": "Emergency Networks", "exchanges": 3, "byLineType": { "mobile": 3 }, "ranges": [ "325", "425", "858" ] }, { "name": "Exiant", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "600", "648" ] }, { "name": "HD Carrier", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "351", "868" ] }, { "name": "IP Horizon", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "367–368" ] }, { "name": "Nuso", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "327", "723" ] }, { "name": "Spectrum", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "263", "412" ] }, { "name": "USA Mobility", "exchanges": 2, "byLineType": { "mobile": 2 }, "ranges": [ "347", "728" ] }, { "name": "Vonage", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "286", "301" ] }, { "name": "8x8", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "881" ] }, { "name": "Brightlink Communications", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "419" ] }, { "name": "Five9", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "394" ] }, { "name": "Network Services", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "219" ] }, { "name": "Peerless Network", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "251" ] }, { "name": "Shelltel", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "446" ] }, { "name": "TELNYX", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "306" ] }, { "name": "Terra Nova Telecom", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "247" ] }, { "name": "Twilio International", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "310" ] }, { "name": "Wavenation", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "384" ] }, { "name": "Wide Voice", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "250" ] } ], "grid": "fffvmmvfmmmummmffffmmvvvvfmffmvmmfffffmvfmmmfmfvmmfvmmmfffffmmmfvmfmfffffffmmfffvfmvvfvmmmmmffvmffmffvfffmvfmfvufmfmmvfmffmffmvfmvmmfvfmmmvmmmmmmffmfmfvfmmvffvmfmfvfvfvvfmfmfmffvmvffmffffvvmffvvfmmfvvffmmfmmmfmfuffmmmmmvmmvmvmvfffffffffffvmmvmmfmmvmmffffffffffvfvvvfvfvv-mm----v--ff-ffffff-f-fmmff--fv-ffmf---f-u-ff---mf-fffffff-vfm-vffffff-f--v-ff-ffff-fu--f-f---fffvmfff-f--fff--f-m-vffv---f----ffvv-mm-f---fmu-ff-fff--fff-fff--f--ffffff---ffv-f-vfffmfff-ff----m-vvvf---ffffffff--mff--vmf--mfff---mu--ffm-f---uff-ffm--f-mff-fvmf-fvm-mff--f-v-v-f-f-mfmffffvvf-ff-ffv-ff-v--mmmf-ff---f-vvvvf-ffff--ffv----f--v-fuf--f------f-f-f-vm-ffvf-fmv---f-vf-ff------v--mff--fm-fvvf----ffffvffvfm--f-v---------vvvfm--f---fvu--f-------mfffmv-----v-f---f--ffvmff--uff--vf-uu----f-fm------f-uvfffffffffvvf-------m-v", "patterns": { "all": "^\\+1858[2-9]\\d{6}$", "fixed_line": "^\\+1858(?:2(?:0[0-27]|1[5-8]|2[578]|3[3-7]|4[046]|5[05-9]|6[3689]|7[0-47-9]|8[15]|9[23679])|3(?:0[02-479]|1[248]|2[01347]|3[24]|4[568]|5[0267]|6[02469]|7[1356]|8[013-6]|9[0147])|4(?:0[0148]|1[023]|2[7-9]|3[0-7]|44|5\\d|6[157]|8[013-8]|9[02569])|5(?:0[2359]|1[349]|2[1-7]|3[04-9]|4[1679]|5[0-248]|6[04-69]|7[0136-8]|8[167]|9[278])|6(?:0[59]|1[346-8]|2[1-35-7]|3[03-8]|4[2369]|5[013-578]|68|7[2-9]|8[349]|9[3-5])|7(?:0[347]|1[2356]|2[03469]|3[167]|4[068]|5[13-69]|6[124589]|7[79]|8[04]|9[02-589])|8(?:05|1[025]|2[246]|3[1246]|4[2578]|59|6[0369]|7[4-79]|8[026])|9(?:0[159]|14|2[3-5]|3[59]|4[2367]|5[126]|6[46]|7[489]|8[0-69]))\\d{4}$", "mobile": "^\\+1858(?:2(?:0[4589]|1[02-49]|2[069]|3[128]|4[1-3589]|5[2-4]|6[0-257]|7[56]|8[27-9]|9[0158])|3(?:0[58]|1[3569]|2[258]|3[015-79]|4[0-479]|5[349]|61|7[0248]|8[29]|9[56])|4(?:0[235-79]|1[4-8]|2[0135]|39|4[0235689]|7[12]|9[34])|5(?:04|[16]8|31|83)|6(?:0[23]|10|52|63|8[28]|9[29])|7(?:05|17|2[28]|3[35]|5[02]|7[4-6])|8(?:29|37|58|64|83)|9(?:02|2[26]|45|[69]7))\\d{4}$", "voip": "^\\+1858(?:2(?:0[36]|2[1-4]|3[09]|47|51|[69]4|8[0346])|3(?:0[16]|1[07]|2[69]|3[38]|5[158]|6[3578]|7[79]|8[78]|9[2389])|4(?:19|2[246]|38|4[17]|6[02-4689]|77)|5(?:00|[29]9|33|44|67|8[58])|6(?:00|4[48]|6[5-7]|87)|7(?:27|32|4[24]|5[78]|66|71|8[6-9])|8(?:0[08]|[27]8|3[38]|44|55|6[78]|8[18]|9[89])|9(?:[01]0|[27]7|33|44|55|8[78]|99))\\d{4}$" }, "sandbox": { "input": "+18585550123", "valid": true, "type": "Fixed line or mobile", "region": "US", "formats": { "e164": "+18585550123", "international": "+1 858-555-0123", "national": "(858) 555-0123", "rfc3966": "tel:+1-858-555-0123" }, "parts": { "countryCode": "+1", "destinationCode": "858", "destinationKind": "area code", "subscriber": "5550123" } }, "faq": [ { "question": "Where is area code 858?", "answer": "Area code 858 is in California, in the United States: all 577 of its exchanges on record are there. From abroad it is dialled +1 858, then the seven-digit number." }, { "question": "Is a 858 number mobile or landline?", "answer": "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 577 exchanges on record in 858, 136 (24%) were allocated as mobile, 322 (56%) as fixed line, 105 (18%) 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." }, { "question": "Which carriers have numbers in area code 858?", "answer": "34 carriers hold exchanges in 858 on record; the most: AT&T (236), Verizon (64) and T-Mobile (45). 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." }, { "question": "How do I validate a 858 phone number?", "answer": "In E.164 a 858 number matches ^\\+1858[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 (858) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP." } ], "neighbours": { "sameRegion": [ "us-209", "us-213", "us-279", "us-310", "us-323", "us-341", "us-350", "us-369", "us-408", "us-415", "us-424", "us-442", "us-510", "us-530", "us-559", "us-562", "us-619", "us-626", "us-628", "us-650", "us-657", "us-661", "us-669", "us-707", "us-714", "us-738", "us-747", "us-760", "us-805", "us-818", "us-820", "us-831", "us-840", "us-909", "us-916", "us-925", "us-949", "us-951" ], "previous": "us-857", "next": "us-859" }, "meta": { "dataAsOf": "2026-10-25", "dataPoints": 577, "references": [ { "authority": "NANPA", "title": "North American Numbering Plan Administrator", "url": "https://nanpa.com/" }, { "authority": "CNAC", "title": "Canadian Numbering Administrator", "url": "https://www.cnac.ca/" }, { "authority": "ITU", "title": "National numbering plan: United States", "url": "https://www.itu.int/oth/T02020000DE/en" } ] } }