{ "url": "https://phonelookup.dev/prefix/us-857", "npa": "857", "slug": "us-857", "iso": "US", "country": "United States", "regions": [ { "code": "MA", "name": "Massachusetts", "exchanges": 382 } ], "exchanges": 382, "known": 366, "byLineType": { "fixed_line": 75, "mobile": 183, "unknown": 16, "voip": 108 }, "carriers": [ { "name": "Verizon", "exchanges": 97, "byLineType": { "fixed_line": 30, "mobile": 67 }, "ranges": [ "200", "202–203", "206–208", "214–215", "218", "224–225", "227", "235", "238", "248", "260", "262–263", "268", "270", "274–276", "278–279", "281–283", "286", "288", "290–292", "294–295", "300–301", "303", "307", "318–319", "321", "323–327", "329–332", "337", "342–345", "350", "353", "359–360", "362–363", "366", "372", "378", "386", "393–394", "406", "408–409", "488", "500", "507", "523–524", "529", "554", "559", "588", "598", "626", "636", "703", "707", "728", "753", "772", "814", "816", "895", "900", "920", "931", "939", "996", "998" ] }, { "name": "T-Mobile", "exchanges": 86, "byLineType": { "mobile": 86 }, "ranges": [ "201", "204", "210", "212", "217", "221–222", "230–231", "233–234", "236–237", "246–247", "249–251", "257–258", "261", "264", "266", "277", "284", "287", "308", "310", "312–313", "316", "320", "333–334", "340", "351–352", "354", "356", "361", "370", "376", "381", "389–391", "395–398", "405", "417", "421", "423", "426–427", "429", "432", "437", "452", "492", "497", "505–506", "526", "540", "544", "565", "579", "605", "615", "654", "656", "701", "719", "762–763", "773", "829", "869", "888", "891", "919", "928", "930", "961" ] }, { "name": "Onvoy", "exchanges": 42, "byLineType": { "voip": 42 }, "ranges": [ "219", "232", "239", "243", "271", "280", "289", "299", "309", "336", "371", "374–375", "380", "382", "384", "392", "412", "420", "422", "428", "475", "477", "520", "567", "575", "577", "597", "663", "666", "675", "678", "754", "800", "810", "837", "855–856", "858", "877", "971", "995" ] }, { "name": "AT&T", "exchanges": 22, "byLineType": { "fixed_line": 4, "mobile": 18 }, "ranges": [ "205", "259", "265", "272", "304", "338", "348", "358", "367", "383", "385", "407", "419", "424–425", "430", "445", "472", "498–499", "944", "989" ] }, { "name": "Paetec Itel", "exchanges": 19, "byLineType": { "fixed_line": 19 }, "ranges": [ "213", "220", "223", "228–229", "252–255", "285", "293", "364", "368", "373", "377", "401", "403", "547", "574" ] }, { "name": "Lumen", "exchanges": 13, "byLineType": { "fixed_line": 10, "voip": 3 }, "ranges": [ "209", "241", "296", "305–306", "315", "317", "413", "453", "504", "706", "776", "972" ] }, { "name": "Bandwidth.com", "exchanges": 10, "byLineType": { "voip": 10 }, "ranges": [ "244", "314", "341", "349", "399", "400", "410", "576", "600", "760" ] }, { "name": "Comcast", "exchanges": 9, "byLineType": { "voip": 9 }, "ranges": [ "267", "273", "297", "322", "387", "404", "449", "496", "991" ] }, { "name": "Ton80 Communications", "exchanges": 9, "byLineType": { "voip": 9 }, "ranges": [ "466–468", "639", "693", "737", "746", "767", "832" ] }, { "name": "Emergency Networks", "exchanges": 7, "byLineType": { "mobile": 7 }, "ranges": [ "298", "822", "833", "847", "857", "867", "887" ] }, { "name": "Peerless Network", "exchanges": 7, "byLineType": { "voip": 7 }, "ranges": [ "240", "256", "269", "369", "444", "777", "999" ] }, { "name": "HD Carrier", "exchanges": 6, "byLineType": { "voip": 6 }, "ranges": [ "402", "414", "557", "587", "799", "997" ] }, { "name": "COMMIO LLC", "exchanges": 5, "byLineType": { "voip": 5 }, "ranges": [ "339", "379", "388", "443", "550" ] }, { "name": "Fractel", "exchanges": 5, "byLineType": { "voip": 5 }, "ranges": [ "465", "688", "755", "758", "766" ] }, { "name": "Tpx Communications", "exchanges": 4, "byLineType": { "fixed_line": 4 }, "ranges": [ "226", "242", "416", "418" ] }, { "name": "Airus Inc", "exchanges": 2, "byLineType": { "fixed_line": 2 }, "ranges": [ "302", "355" ] }, { "name": "Brightlink Communications", "exchanges": 2, "byLineType": { "mobile": 1, "voip": 1 }, "ranges": [ "365", "702" ] }, { "name": "Shelltel", "exchanges": 2, "byLineType": { "mobile": 2 }, "ranges": [ "433–434" ] }, { "name": "YMax Communications", "exchanges": 2, "byLineType": { "voip": 2 }, "ranges": [ "216", "245" ] }, { "name": "8x8", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "881" ] }, { "name": "Advanced Telecom Solutions", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "347" ] }, { "name": "Altice", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "491" ] }, { "name": "Barr Tell USA", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "880" ] }, { "name": "CSC Wireless LLC", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "335" ] }, { "name": "Megaphone Inc", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "357" ] }, { "name": "MetTel", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "756" ] }, { "name": "Skyetel", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "788" ] }, { "name": "Telengy LLC", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "346" ] }, { "name": "Twilio International", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "578" ] }, { "name": "Voice Application Network", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "757" ] }, { "name": "Voip Street", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "328" ] }, { "name": "Vonage", "exchanges": 1, "byLineType": { "voip": 1 }, "ranges": [ "415" ] }, { "name": "Wavenation", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "431" ] }, { "name": "West Telecom", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "770" ] }, { "name": "Wide Voice", "exchanges": 1, "byLineType": { "fixed_line": 1 }, "ranges": [ "957" ] }, { "name": "Worldcall Interconnect", "exchanges": 1, "byLineType": { "mobile": 1 }, "ranges": [ "990" ] } ], "grid": "mmmfmmmmmfmumfmfvmfvfmmffmffffmmvmmfmmfvvffvvvmmmmmmffffvmmmmmmmmmmvmvmvmvmmmmmmvmfmmfmmfvmmmfmmfvmvmmfmffvfmvmummvvmvfmmmvfmmmmvmmmmmmmvmfvmvmmmmvvmvmmmfmfmvmmmmfmfvmffvmvmfvvmffvvmvfvmfvvmmmvmfmmmmvvfvfvmmmmmvuvfvvfmfmvmvmmmmmvmmfmmm--m-----vvm---v--mf-----------vvvv---m--v-v----------m--fm---vmmmm---fmmm---u--------v--mf-m--m----------m---m--f--v---fu-v-f-----m-v------fvvvvm-------vf--------vf-v----m-----u---m-u--------f---------m--v--------------m-m------v--v--------v--v---------v----v------ummm--fm---u-------m--------f--------v--------v------mvvfvv-v-mm--vv--f-mm--fv----------v----------vv---------vu--f-f-----m------m--vm---v---------m-------vvmv--------m-m-------v--fv-----mm--m---m----f----------u-------mf-------m-mf-------mu---m-----u------fuu-m---------vf---u------------mmv---vfvmv", "patterns": { "all": "^\\+1857[2-9]\\d{6}$", "fixed_line": "^\\+1857(?:2(?:0[39]|1[358]|2[0346-9]|3[58]|4[12]|5[2-5]|8[258]|9[36])|3(?:0[2457]|[13]8|23|5[35]|6[2478]|7[378]|8[36]|94)|4(?:0[13]|1[368]|[39]1|53)|5(?:[027]4|47|5[49]|[89]8)|626|7(?:[05]6|28|7[06])|8(?:1[46]|80)|9(?:[02]0|31|57|72|96))\\d{4}$", "mobile": "^\\+1857(?:2(?:0[0-24-8]|1[0247]|2[125]|3[013467]|4[6-9]|5[017-9]|6[0-68]|7[024-9]|8[13467]|9[0-2458])|3(?:0[0138]|1[02369]|2[014-79]|3[0-57]|4[02-58]|5[0-24689]|6[0136]|7[026]|8[159]|9[0135-8])|4(?:0[5-9]|1[79]|2[13-79]|3[02-47]|45|[57]2|88|9[27-9])|5(?:0[05-7]|2[369]|4[04]|65|79)|6(?:[01]5|36|5[46])|7(?:0[1-37]|19|53|[67][23])|8(?:2[29]|33|[45]7|6[79]|8[78]|9[15])|9(?:[18]9|28|3[09]|44|61|9[08]))\\d{4}$", "voip": "^\\+1857(?:2(?:1[69]|3[29]|4[03-5]|56|[69][79]|7[13]|8[09])|3(?:[03][69]|1[457]|2[28]|4[1679]|57|6[59]|7[1459]|8[02478]|9[29])|4(?:0[024]|1[0245]|2[028]|4[349]|6[5-8]|7[57]|96)|5(?:20|5[07]|[689]7|7[5-8])|6(?:00|39|6[36]|7[58]|88|93)|7(?:[37]7|46|5[4578]|6[067]|88|99)|8(?:[01]0|3[27]|5[568]|77|81)|9(?:71|9[1579]))\\d{4}$" }, "sandbox": { "input": "+18575550123", "valid": true, "type": "Fixed line or mobile", "region": "US", "formats": { "e164": "+18575550123", "international": "+1 857-555-0123", "national": "(857) 555-0123", "rfc3966": "tel:+1-857-555-0123" }, "parts": { "countryCode": "+1", "destinationCode": "857", "destinationKind": "area code", "subscriber": "5550123" } }, "faq": [ { "question": "Where is area code 857?", "answer": "Area code 857 is in Massachusetts, in the United States: all 382 of its exchanges on record are there. From abroad it is dialled +1 857, then the seven-digit number." }, { "question": "Is a 857 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 382 exchanges on record in 857, 183 (48%) were allocated as mobile, 75 (20%) as fixed line, 108 (28%) as VoIP and 16 (4%) 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 857?", "answer": "36 carriers hold exchanges in 857 on record; the most: Verizon (97), T-Mobile (86) and Onvoy (42). 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 857 phone number?", "answer": "In E.164 a 857 number matches ^\\+1857[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 (857) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP." } ], "neighbours": { "sameRegion": [ "us-339", "us-351", "us-413", "us-508", "us-617", "us-774", "us-781", "us-978" ], "previous": "us-856", "next": "us-858" }, "meta": { "dataAsOf": "2026-10-25", "dataPoints": 382, "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" } ] } }