{ "url": "https://phonelookup.dev/prefix/us-337", "npa": "337", "slug": "us-337", "iso": "US", "country": "United States", "regions": [ { "code": "LA", "name": "Louisiana", "exchanges": 617 } ], "exchanges": 617, "known": 603, "byLineType": { "fixed_line": 299, "mobile": 210, "unknown": 14, "voip": 94 }, "carriers": [ { "name": "AT&T", "exchanges": 255, "byLineType": { "fixed_line": 154, "mobile": 98, "voip": 3 }, "ranges": [ "203–204", "208", "216–217", "229", "231–240", "242", "245–246", "250", "252", "254", "256–258", "260–262", "264–269", "272–273", "275–276", "278–280", "282", "286–291", "294–295", "298", "302–304", "308–309", "315", "317", "321–322", "324", "334", "342", "344", "349–351", "353–354", "356", "358–359", "364–365", "367–369", "371–374", "380", "382–384", "388", "392–396", "400", "403", "406–407", "413", "419", "421", "428", "430–431", "433", "436–440", "452", "457", "459–460", "462–463", "466", "470–471", "474–480", "482", "485–489", "491", "493–497", "499", "501", "508–509", "512", "515–516", "519–521", "526–533", "535–537", "543", "545–546", "550–552", "560", "562", "566", "570–573", "575", "577–581", "585", "589", "592–594", "598", "603", "616", "620", "623", "625–626", "653–656", "660–661", "692", "703", "706–708", "712", "721", "764", "774", "783–785", "788", "804", "821", "824–826", "828–829", "831", "836–837", "839", "842", "849", "851–853", "855–857", "867", "873", "879", "882", "884", "886", "888", "892–893", "896", "898", "920", "923–924", "937", "940", "942–943", "945", "948", "962", "965", "967", "981", "983–984", "988–989", "991", "993" ] }, { "name": "Lumen", "exchanges": 67, "byLineType": { "fixed_line": 64, "voip": 3 }, "ranges": [ "205", "210", "214", "220", "228", "284", "310", "312–313", "326", "332", "360", "363", "376", "378", "381", "397", "401", "404", "409", "415", "422–423", "432", "447", "461", "465", "468", "505–507", "513–514", "525", "541", "582", "584", "587–588", "599", "607", "609", "622", "639", "662", "666–668", "680", "684", "724–725", "734–735", "738", "743", "749", "753–754", "756", "761", "769", "779", "786", "806", "845", "885" ] }, { "name": "Verizon", "exchanges": 55, "byLineType": { "fixed_line": 2, "mobile": 53 }, "ranges": [ "200", "207", "223–224", "226–227", "230", "241", "244", "247", "263", "277", "281", "296", "301", "305–307", "329", "331", "336", "339–340", "346–347", "352", "357", "366", "375", "410", "414", "416–417", "427", "441", "448", "458", "467", "510", "522–523", "544", "548", "553", "591", "605", "636", "658", "789", "793", "909", "930", "936", "977", "998" ] }, { "name": "T-Mobile", "exchanges": 43, "byLineType": { "mobile": 43 }, "ranges": [ "201", "212–213", "215", "218", "222", "249", "251", "255", "274", "292", "300", "316", "319–320", "335", "338", "343", "348", "370", "377", "379", "387", "389–391", "424", "540", "563", "567", "574", "618", "630", "693", "739", "766", "780–781", "787", "794", "796", "802", "912" ] }, { "name": "Paetec Itel", "exchanges": 34, "byLineType": { "fixed_line": 34 }, "ranges": [ "202", "221", "314", "323", "327", "330", "333", "385", "405", "408", "418", "464", "492", "502–503", "517", "568", "606", "608", "701–702", "704", "714", "717–718", "772", "777", "803", "809", "858", "904", "915", "917", "990" ] }, { "name": "Onvoy", "exchanges": 28, "byLineType": { "voip": 28 }, "ranges": [ "243", "318", "337", "345", "420", "429", "446", "453", "455", "472–473", "481", "539", "547", "559", "561", "576", "590", "600–601", "604", "617", "619", "637", "800", "818", "847", "900" ] }, { "name": "Comcast", "exchanges": 22, "byLineType": { "voip": 22 }, "ranges": [ "253", "283", "285", "361", "398", "412", "434", "442", "444–445", "449", "451", "454", "456", "490", "504", "524", "565", "907", "918", "935", "944" ] }, { "name": "Ton80 Communications", "exchanges": 13, "byLineType": { "voip": 13 }, "ranges": [ "586", "627", "674", "722", "727", "742", "746", "748", "767–768", "832", "846", "848" ] }, { "name": "Kaplan Telephone Company", "exchanges": 10, "byLineType": { "fixed_line": 10 }, "ranges": [ "225", "612", "614", "642–643", "652", "737", "740", "782", "830" ] }, { "name": "Cameron Telephone Company", "exchanges": 7, "byLineType": { "fixed_line": 7 }, "ranges": [ "538", "542", "558", "569", "583", "762", "775" ] }, { "name": "COMMIO LLC", "exchanges": 6, "byLineType": { "voip": 6 }, "ranges": [ "597", "610", "613", "615", "770", "946" ] }, { "name": "USA Mobility", "exchanges": 6, "byLineType": { "mobile": 6 }, "ranges": [ "219", "271", "293", "297", "299", "596" ] }, { "name": "Advanced Telephone", "exchanges": 5, "byLineType": { "fixed_line": 5 }, "ranges": [ "206", "209", "248", "325", "355" ] }, { "name": "Bandwidth.com", "exchanges": 5, "byLineType": { "voip": 5 }, "ranges": [ "362", "426", "556", "595", "999" ] }, { "name": "Emergency Networks", "exchanges": 5, "byLineType": { "mobile": 5 }, "ranges": [ "386", "730", "771", "773", "901" ] }, { "name": "IP Horizon", "exchanges": 4, "byLineType": { "voip": 4 }, "ranges": [ "554", "690–691", "757" ] }, { "name": "Lafayette Utilities System", "exchanges": 4, "byLineType": { "fixed_line": 4 }, "ranges": [ "450", "469", "534", "651" ] }, { "name": "Spectrum", "exchanges": 4, "byLineType": { "fixed_line": 4 }, "ranges": [ "435", "628", "678", "841" ] }, { "name": "Fractel", "exchanges": 3, "byLineType": { "voip": 3 }, "ranges": [ "677", "688", "877" ] }, { "name": "Optimum", "exchanges": 3, "byLineType": { "fixed_line": 3 }, "ranges": [ "341", "564", "602" ] }, { "name": "Brightlink Communications", "exchanges": 2, "byLineType": { "mobile": 1, "voip": 1 }, "ranges": [ "443", "822" ] }, { "name": "Dish Wireless", "exchanges": 2, "byLineType": { "mobile": 2 }, "ranges": [ "634", "645" ] }, { "name": "Hunt Telecom", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "402", "889" ] }, { "name": "Nuso", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "425", "484" ] }, { "name": "Airus Inc", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "557" ] }, { "name": "American Messaging", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "713" ] }, { "name": "CSC Wireless LLC", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "549" ] }, { "name": "Cameron Communications", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "905" ] }, { "name": "Delcambre Telephone Company", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "685" ] }, { "name": "Detel Wireless", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "518" ] }, { "name": "Elizabeth Telephone Company", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "328" ] }, { "name": "Exiant", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "270" ] }, { "name": "Global Data Systems", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "500" ] }, { "name": "HD Carrier", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "259" ] }, { "name": "Opentact", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "758" ] }, { "name": "TELNYX", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "483" ] }, { "name": "Terra Nova Telecom", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "799" ] }, { "name": "Twilio International", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "895" ] }, { "name": "Vonage", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "399" ] }, { "name": "Wavenation", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "903" ] } ], "grid": "mmfmfffmmffummfmffmmvfmmmfmmffmfffffffffmmmvmmmmfmmmfvfmmmmvfffmffffffvmffmmfmmfmmfvfvfmmfmfmmffmmmmmmmmmmmmmmfufffmmmvmmmmfvffffmfmfffmmvmmmfmmmvmmmmmmmmffmmmffvvfffffmfmfmffmfmfmmfmfmfmmmmmmffffmfvvmffmffffffmuvfmfmmfmvfffmfvmmvffffvfffmffmvmvvvfmvfvmvvvvfmmffffffmmfffvvvffmffffvfvfmmmmmvffffmmf-mfmffvffffmmumffmmffmmfmmvfmffmffmffffffvmvffmffvfmffmmvuvffvfvfmfvfmffmffvmmvmmmmmffffvfffvmmffvmvffvvfmvmfffvvufvfvfvmvf-ff-ffvf-m---m-mv-f--ff-m-----fffmmf-m-mmf---fff-----v--vf-f---ff--v-vvmm------uffff-fmf--ummf--ff--fv-ff-v--m---ff-ffmf-vf--v-vf---ff-fvf--ff-m-mvvfvmfmff-f-fmmfffffmfm---mm-m--vv-mff-f--f-u------v--fv-fff-fffmv---ff-f-fm--fvvvm-fmm-ffff--------f-----f---v-f--f-mff-mf--ff-vf-f-vm-fff-v-m-um--f-fv-f--ff-----m----vmf--m-ffvmv-f-u-------uu--m--m-m--------um---f-ff---ffff-f----mv", "patterns": { "all": "^\\+1337[2-9]\\d{6}$", "fixed_line": "^\\+1337(?:2(?:0[24-69]|1[0467]|2[1589]|3[1-9]|48|5[24]|6[0-24-9]|7[2369]|8[2469]|9[145])|3(?:[13][02-4]|2[35-8]|41|5[459]|6[03-79]|7[13468]|8[135]|9[2-57])|4(?:0[124-9]|1[358]|2[1-35]|3[0-35-79]|[45][07]|6[0-589]|7[0457-9]|8[024]|9[1-47])|5(?:0[0235-8]|1[3478]|2[1578]|3[013-8]|4[23568]|5[0178]|6[024689]|7[12]|8[2-57-9]|9[3489])|6(?:[06][26-8]|1[246]|2[023568]|39|4[23]|5[1-36]|78|8[045])|7(?:0[1-468]|1[478]|2[145]|3[4578]|4[039]|5[3468]|6[129]|7[24579]|8[2-68])|8(?:0[3469]|2[14-689]|3[0679]|4[15]|5[15-8]|67|7[39]|8[2569]|9[2368])|9(?:0[3-5]|1[57]|2[034]|37|4[238]|8[13489]|9[013]))\\d{4}$", "mobile": "^\\+1337(?:2(?:0[01378]|1[23589]|2[2-467]|30|4[0-24-79]|5[015-8]|63|7[14578]|8[0178]|9[0236-9])|3(?:0\\d|1[5-79]|2[0-29]|3[15689]|4[02-46-9]|5[0-36-8]|68|7[02579]|8[0246-9]|9[016])|4(?:0[03]|1[04679]|2[478]|38|4[138]|5[289]|6[67]|76|8[5-9]|9[569])|5(?:0[19]|1[02569]|2[02369]|32|4[049]|5[23]|6[37]|7[0457-9]|8[01]|9[126])|6(?:0[35]|18|3[046]|45|5[458]|6[01]|9[23])|7(?:07|1[23]|3[09]|6[46]|7[13]|8[0179]|9[346])|8(?:02|31|4[29]|5[23]|8[48])|9(?:0[19]|12|3[06]|4[05]|6[257]|77|98))\\d{4}$", "voip": "^\\+1337(?:2(?:[27]0|43|5[39]|8[35])|3(?:18|24|37|45|6[12]|9[89])|4(?:12|2[069]|34|4[24-69]|5[13-6]|7[1-3]|8[13]|90)|5(?:[02]4|39|4[17]|5[469]|6[15]|7[36]|86|9[057])|6(?:0[0149]|1[03579]|[23]7|7[47]|88|9[01])|7(?:2[27]|4[268]|57|6[78]|70|99)|8(?:00|18|[23]2|4[6-8]|77|95)|9(?:0[07]|18|35|4[46]|99))\\d{4}$" }, "sandbox": { "input": "+13375550123", "valid": true, "type": "Fixed line or mobile", "region": "US", "formats": { "e164": "+13375550123", "international": "+1 337-555-0123", "national": "(337) 555-0123", "rfc3966": "tel:+1-337-555-0123" }, "parts": { "countryCode": "+1", "destinationCode": "337", "destinationKind": "area code", "subscriber": "5550123" } }, "faq": [ { "question": "Where is area code 337?", "answer": "Area code 337 is in Louisiana, in the United States: all 617 of its exchanges on record are there. From abroad it is dialled +1 337, then the seven-digit number." }, { "question": "Is a 337 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 617 exchanges on record in 337, 210 (34%) were allocated as mobile, 299 (48%) as fixed line, 94 (15%) 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 337?", "answer": "40 carriers hold exchanges in 337 on record; the most: AT&T (255), Lumen (67) and Verizon (55). 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 337 phone number?", "answer": "In E.164 a 337 number matches ^\\+1337[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 (337) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP." } ], "neighbours": { "sameRegion": [ "us-225", "us-318", "us-504", "us-985" ], "previous": "us-336", "next": "us-339" }, "meta": { "dataAsOf": "2026-10-25", "dataPoints": 617, "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" } ] } }