{ "url": "https://phonelookup.dev/prefix/us-731", "npa": "731", "slug": "us-731", "iso": "US", "country": "United States", "regions": [ { "code": "TN", "name": "Tennessee", "exchanges": 410 } ], "exchanges": 410, "known": 396, "byLineType": { "fixed_line": 223, "mobile": 112, "unknown": 14, "voip": 61 }, "carriers": [ { "name": "AT&T", "exchanges": 143, "byLineType": { "fixed_line": 87, "mobile": 53, "voip": 3 }, "ranges": [ "203–204", "206", "208–209", "215–218", "220–222", "224", "226–228", "230–231", "235–236", "239", "250", "253–255", "263–265", "267", "272", "279", "285–288", "291–292", "295", "331–332", "334–335", "352", "361", "376", "394", "420–427", "437", "443", "450", "460", "462", "469", "479", "501", "512", "532", "535–536", "538", "541", "584", "589", "593", "607–610", "612–614", "616–618", "627", "635–636", "641–642", "644–646", "648", "658–661", "663–664", "668", "686", "692", "699", "707", "723", "730", "733", "738", "749", "764", "772", "779–780", "783–784", "787", "793", "796", "798", "803", "824", "836", "855", "879", "884–886", "925–928", "934–935", "944", "967–968", "980", "982–984", "986–989", "991", "995" ] }, { "name": "Verizon", "exchanges": 45, "byLineType": { "fixed_line": 3, "mobile": 42 }, "ranges": [ "223", "225", "233–234", "307", "318–319", "330", "333", "336", "343", "345", "358", "363", "377", "412–415", "431–435", "441–442", "445–446", "487", "499", "504", "513–514", "552", "571", "592", "621", "676", "693–695", "697", "819", "931", "961" ] }, { "name": "Lumen", "exchanges": 40, "byLineType": { "fixed_line": 40 }, "ranges": [ "205", "212–214", "271", "274–276", "327", "337", "388", "393", "418–419", "438–439", "451", "472", "474", "483", "503", "506", "540", "577", "599", "602", "624", "630", "632", "687–689", "732", "837", "859", "868", "882", "903", "907", "937" ] }, { "name": "Sinch (Inteliquent)", "exchanges": 36, "byLineType": { "voip": 36 }, "ranges": [ "200", "202", "237", "240–241", "245–246", "248", "258", "260", "262", "266", "268–270", "294", "310", "312", "316", "321", "400", "497", "510", "574", "600", "666", "710", "731", "734", "747", "770", "800", "891", "910", "924", "999" ] }, { "name": "Paetec Itel", "exchanges": 21, "byLineType": { "fixed_line": 21 }, "ranges": [ "249", "256", "281", "341", "389", "407", "410", "453", "461", "468", "470", "478", "518–519", "595", "623", "633", "671", "727", "792", "951" ] }, { "name": "Aeneas", "exchanges": 18, "byLineType": { "fixed_line": 18 }, "ranges": [ "403", "436", "480", "520", "554", "558", "562", "585", "597", "625", "651", "653–654", "698", "713", "809–810", "894" ] }, { "name": "Spectrum", "exchanges": 17, "byLineType": { "fixed_line": 17 }, "ranges": [ "207", "210", "251–252", "257", "278", "282", "296", "309", "315", "404", "628", "678", "681", "703", "736", "741" ] }, { "name": "T-Mobile", "exchanges": 11, "byLineType": { "mobile": 11 }, "ranges": [ "259", "273", "277", "293", "298", "313", "324–326", "444", "467" ] }, { "name": "Frontier", "exchanges": 9, "byLineType": { "fixed_line": 9 }, "ranges": [ "261", "364", "456", "587–588", "799", "822", "881", "973" ] }, { "name": "West Kentucky Networks", "exchanges": 8, "byLineType": { "fixed_line": 8 }, "ranges": [ "232", "247", "297", "498", "559", "643", "673", "782" ] }, { "name": "TDS Telecom", "exchanges": 7, "byLineType": { "fixed_line": 7 }, "ranges": [ "500", "549", "586", "845", "847", "852", "858" ] }, { "name": "Bandwidth.com", "exchanges": 6, "byLineType": { "voip": 6 }, "ranges": [ "201", "238", "280", "284", "289", "603" ] }, { "name": "Emergency Networks", "exchanges": 5, "byLineType": { "mobile": 5 }, "ranges": [ "219", "477", "531", "533", "831" ] }, { "name": "TELNYX", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "229", "244", "458", "888" ] }, { "name": "Ton80 Communications", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "543", "737", "766", "844" ] }, { "name": "West Tennessee Telephone Company", "exchanges": 4, "byLineType": { "fixed_line": 4 }, "ranges": [ "662", "665", "669", "742" ] }, { "name": "Crockett Telephone Company", "exchanges": 3, "byLineType": { "fixed_line": 3 }, "ranges": [ "656", "677", "696" ] }, { "name": "Jackson Energy", "exchanges": 3, "byLineType": { "fixed_line": 3 }, "ranges": [ "242", "300", "507" ] }, { "name": "Fractel", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "529", "900" ] }, { "name": "Peerless Network", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "283", "777" ] }, { "name": "Access2Go", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "290" ] }, { "name": "COMMIO LLC", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "867" ] }, { "name": "Cellular South", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "402" ] }, { "name": "Millington Telephone Company", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "548" ] }, { "name": "Opentact", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "465" ] }, { "name": "Peoples Telephone Company", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "243" ] }, { "name": "Skyetel", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "788" ] }, { "name": "Terra Nova Telecom", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "877" ] } ], "grid": "vvvfffmfmffuffffmmfmmffmfmmmfvmffmmfvvvfvvffvvvfvfmffffmffvmvfvfffvmvvvfmmfffmffvffvvffffvvfmmvmffm-f------m-fvuvm-fv-ff-v--mmmf--fmmmmmmf---f-m-m------f-----m--m-mf-----------fm----------ff---fm-----v-mff--f--fummmm--ffmfffffff---mmmmmfmff-mmmmmm---ff-f--f-v-mfv--f-mfff-f-f--mfff--f---m---------vfmfm-fm-ff--vufmm---fff--------v-mmm-mf-f-ff-v----ff--m-fu--ff--f--------m--v--f------fffffm--mf-f-f-fv-fv---mmmmummm-mmm--m-fff-ff-f-ff-fm----ffffff-f--f-ff-f-ffffffffv-ff-f-f--mff--f----ffff--fmmmfmfmu--f---m--vu-f---------f---f--mvfmv-fvf--ff----v-f--------------f-v---v-f----v-fm-fff--fv---fm--m-mfv--m-----ffu-------m--f-f------m----ff------vf-f----f--f--ff-------vf--------v-m-ff-fff-v--v--f-----v--f---f--vu------------vfffm--m--ff-f------f-----uf------uu-m-----ff----f--u---m-vff-ffff-m---m---v", "patterns": { "all": "^\\+1731[2-9]\\d{6}$", "fixed_line": "^\\+1731(?:2(?:0[3-579]|1[02-58]|2[1248]|3[1259]|4[2379]|5[1-467]|6[13-5]|7[14-689]|8[125-8]|9[167])|3(?:0[09]|1[589]|27|3[07]|41|52|64|76|8[89]|93)|4(?:0[347]|1[089]|2[1-7]|3[689]|5[0136]|6[1589]|7[02489]|8[03]|98)|5(?:0[0367]|1[289]|20|3[68]|4[0189]|5[489]|62|77|8[4-8]|9[3579])|6(?:02|2[3-578]|3[0235]|4[1-68]|5[134689]|6[0-589]|7[1378]|8[16-9]|9[268])|7(?:[01]3|2[37]|3[268]|4[129]|64|[79][29]|8[2-47])|8(?:09|10|2[24]|3[67]|4[57]|5[2589]|68|8[124-6]|94)|9(?:0[37]|2[5-7]|3[457]|44|51|6[78]|73|8[346-9]))\\d{4}$", "mobile": "^\\+1731(?:2(?:0[68]|1[679]|2[035-7]|3[034]|5[059]|67|7[237]|9[2358])|3(?:[07]7|13|2[4-6]|3[1-6]|4[35]|58|6[13]|94)|4(?:02|1[2-5]|20|3[1-57]|4[1-6]|6[07]|[78]7|99)|5(?:0[14]|1[34]|3[1-35]|[59]2|71|89)|6(?:0[7-9]|1[02-46-8]|21|[37]6|9[3-579])|7(?:07|3[03]|80|9[368])|8(?:03|[17]9|31)|9(?:28|[36]1|80|9[15]))\\d{4}$", "voip": "^\\+1731(?:2(?:0[0-2]|29|3[6-8]|4[014-68]|58|6[02689]|70|8[0349]|9[04])|3(?:1[026]|21)|4(?:00|58|62|97)|5(?:10|29|43|74)|6(?:0[03]|66)|7(?:10|3[147]|47|66|7[07]|88)|8(?:00|44|[67]7|88|91)|9(?:[01]0|24|82|99))\\d{4}$" }, "sandbox": { "input": "+17315550123", "valid": true, "type": "Fixed line or mobile", "region": "US", "formats": { "e164": "+17315550123", "international": "+1 731-555-0123", "national": "(731) 555-0123", "rfc3966": "tel:+1-731-555-0123" }, "parts": { "countryCode": "+1", "destinationCode": "731", "destinationKind": "area code", "subscriber": "5550123" } }, "faq": [ { "question": "Where is area code 731?", "answer": "Area code 731 is in Tennessee, in the United States: all 410 of its exchanges on record are there. From abroad it is dialled +1 731, then the seven-digit number." }, { "question": "Is a 731 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 410 exchanges on record in 731, 112 (27%) were allocated as mobile, 223 (54%) as fixed line, 61 (15%) as VoIP and 14 (3%) 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 731?", "answer": "28 carriers hold exchanges in 731 on record; the most: AT&T (143), Verizon (45) and Lumen (40). 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 731 phone number?", "answer": "In E.164 a 731 number matches ^\\+1731[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 (731) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP." } ], "neighbours": { "sameRegion": [ "us-423", "us-615", "us-629", "us-865", "us-901", "us-931" ], "previous": "us-730", "next": "us-732" }, "meta": { "dataAsOf": "2026-10-25", "dataPoints": 410, "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" } ] } }