{
  "url": "https://phonelookup.dev/prefix/us-557",
  "npa": "557",
  "slug": "us-557",
  "iso": "US",
  "country": "United States",
  "regions": [
    {
      "code": "MO",
      "name": "Missouri",
      "exchanges": 97
    }
  ],
  "exchanges": 97,
  "known": 83,
  "byLineType": {
    "fixed_line": 22,
    "mobile": 38,
    "unknown": 14,
    "voip": 23
  },
  "carriers": [
    {
      "name": "AT&T",
      "exchanges": 38,
      "byLineType": {
        "fixed_line": 15,
        "mobile": 23
      },
      "ranges": [
        "201",
        "205–206",
        "213–214",
        "216–218",
        "220",
        "224–225",
        "227",
        "229–231",
        "234–235",
        "237–238",
        "240",
        "243–245",
        "247",
        "251",
        "253–254",
        "261–264",
        "273",
        "362",
        "454",
        "653",
        "747",
        "953",
        "996"
      ]
    },
    {
      "name": "Onvoy",
      "exchanges": 18,
      "byLineType": {
        "voip": 18
      },
      "ranges": [
        "200",
        "208–209",
        "221",
        "226",
        "241–242",
        "249",
        "255–259",
        "265",
        "333",
        "444",
        "467",
        "557"
      ]
    },
    {
      "name": "Verizon",
      "exchanges": 8,
      "byLineType": {
        "mobile": 8
      },
      "ranges": [
        "210",
        "219",
        "223",
        "228",
        "232",
        "236",
        "239",
        "260"
      ]
    },
    {
      "name": "Emergency Networks",
      "exchanges": 3,
      "byLineType": {
        "mobile": 3
      },
      "ranges": [
        "500",
        "507",
        "567"
      ]
    },
    {
      "name": "Five9",
      "exchanges": 2,
      "byLineType": {
        "fixed_line": 2
      },
      "ranges": [
        "204",
        "207"
      ]
    },
    {
      "name": "T-Mobile",
      "exchanges": 2,
      "byLineType": {
        "mobile": 2
      },
      "ranges": [
        "203",
        "212"
      ]
    },
    {
      "name": "Terra Nova Telecom",
      "exchanges": 2,
      "byLineType": {
        "voip": 2
      },
      "ranges": [
        "777",
        "888"
      ]
    },
    {
      "name": "8x8",
      "exchanges": 1,
      "byLineType": {
        "voip": 1
      },
      "ranges": [
        "880"
      ]
    },
    {
      "name": "Callworks Corporation",
      "exchanges": 1,
      "byLineType": {
        "voip": 1
      },
      "ranges": [
        "215"
      ]
    },
    {
      "name": "Comcast",
      "exchanges": 1,
      "byLineType": {
        "voip": 1
      },
      "ranges": [
        "202"
      ]
    },
    {
      "name": "Dish Wireless",
      "exchanges": 1,
      "byLineType": {
        "mobile": 1
      },
      "ranges": [
        "233"
      ]
    },
    {
      "name": "E. Ritter Communications",
      "exchanges": 1,
      "byLineType": {
        "fixed_line": 1
      },
      "ranges": [
        "248"
      ]
    },
    {
      "name": "Leap Telecom",
      "exchanges": 1,
      "byLineType": {
        "fixed_line": 1
      },
      "ranges": [
        "222"
      ]
    },
    {
      "name": "Shelltel",
      "exchanges": 1,
      "byLineType": {
        "mobile": 1
      },
      "ranges": [
        "252"
      ]
    },
    {
      "name": "Tpx Communications",
      "exchanges": 1,
      "byLineType": {
        "fixed_line": 1
      },
      "ranges": [
        "250"
      ]
    },
    {
      "name": "Wavenation",
      "exchanges": 1,
      "byLineType": {
        "fixed_line": 1
      },
      "ranges": [
        "246"
      ]
    },
    {
      "name": "Wiretap Telecom",
      "exchanges": 1,
      "byLineType": {
        "fixed_line": 1
      },
      "ranges": [
        "999"
      ]
    }
  ],
  "grid": "vfvmffffvvmummmvfmmmmvfmfmvmmmmfmmmmmmmmfvvmmffmfvfmmmmvvvvvmmmmmv-------f-------------------------------------u---------------------v----------------------------f------------------------------------------------u--------------------------------v---------f------------v--------------------------------m------m---u-------------------------------------------u-v---------m-------------------------------------------u-----------------------------------------f----------------------------------------------u----------u-----------------------------------f-----------------------------v---------------------------------u--------------------------------------------------------------------v-------v----------------------u--------------------------------------u--f----uu----------------u-------------------f--f",
  "patterns": {
    "all": "^\\+1557[2-9]\\d{6}$",
    "fixed_line": "^\\+1557(?:2(?:0[14-7]|16|2[24]|31|4[0568]|50|73)|362|454|653|747|9(?:53|9[69]))\\d{4}$",
    "mobile": "^\\+1557(?:2(?:03|1[02-47-9]|2[0357-9]|3[02-9]|4[347]|5[1-4]|6[0-4])|5(?:0[07]|67))\\d{4}$",
    "voip": "^\\+1557(?:2(?:0[0289]|[16]5|2[16]|4[129]|5[5-9])|333|4(?:44|67)|557|777|88[08])\\d{4}$"
  },
  "sandbox": {
    "input": "+15575550123",
    "valid": true,
    "type": "Fixed line or mobile",
    "region": "US",
    "formats": {
      "e164": "+15575550123",
      "international": "+1 557-555-0123",
      "national": "(557) 555-0123",
      "rfc3966": "tel:+1-557-555-0123"
    },
    "parts": {
      "countryCode": "+1",
      "destinationCode": "557",
      "destinationKind": "area code",
      "subscriber": "5550123"
    }
  },
  "faq": [
    {
      "question": "Where is area code 557?",
      "answer": "Area code 557 is in Missouri, in the United States: all 97 of its exchanges on record are there. From abroad it is dialled +1 557, then the seven-digit number."
    },
    {
      "question": "Is a 557 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 97 exchanges on record in 557, 38 (39%) were allocated as mobile, 22 (23%) as fixed line, 23 (24%) as VoIP and 14 (14%) 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 557?",
      "answer": "17 carriers hold exchanges in 557 on record; the most: AT&T (38), Onvoy (18) and Verizon (8). 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 557 phone number?",
      "answer": "In E.164 a 557 number matches ^\\+1557[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 (557) 555-0123. The exchange patterns on this page narrow it to the exchanges allocated as mobile, fixed line or VoIP."
    }
  ],
  "neighbours": {
    "sameRegion": [
      "us-235",
      "us-314",
      "us-417",
      "us-573",
      "us-636",
      "us-660",
      "us-816",
      "us-975"
    ],
    "previous": "us-551",
    "next": "us-559"
  },
  "meta": {
    "dataAsOf": "2026-10-25",
    "dataPoints": 97,
    "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"
      }
    ]
  }
}