Input a CLLI:

Tip: A Partial CLLI can be entered, but must contain a minimum of the first 6 characters. I.E. 'DLLSTX'

If you were a paid member, you could be loading this into any version of Excel or Access (or any other software that understands CSV) right now for less than you paid for your breakfast or lunch today. If you are a member please login to access this and other functionality.

🔎 Tip: Click any Company, OCN, Rate Center, or CLLI to explore related telecom data

npa-nxxStateCompanyFRNRMDOCNRate CenterCLLIAssign DateMisc
817-270TXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS000/00/0000Prefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270 is split into 1,000-number blocks - detail below
817-270-0XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-1XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-2XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-3XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-4XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-5XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-270-8XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-444TXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS000/00/0000Prefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-813TXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS002/08/2001Prefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
817-813 is split into 1,000-number blocks - detail below
817-813-0XXXTXFRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (Verizon Communications)N/AN/A4344AZLEAZLETXXADS0N/APrefix Type: RBOC
Switch Name: AZLE
Switch Type: NTDMS100
LATA: Dallas TX (552)
Tandem: FTWOTXED03T
🔧 Explore Switch(CLLI: AZLETXXADS0))
🕘 Prefix History
🔎 Explore Carrier Information
This information is not guaranteed to be accurate. User assumes all risk for any loss or gain resulting from use of this data.
Although I strive for accuracy and prompt updates of changed information, it is possible that there may be errors. If you see one, could you please report it?
Please report all errors, flames, questions, suggestions, and thanks to Paul Timmins
L'exactitude de ces renseignements n'est pas garantie. L'utilisateur assume l'entière responsabilité des pertes ou des gains découlant de l'utilisation de ces données.
Bien que je m'efforce d'assurer l'exactitude des informations et de les mettre à jour rapidement, des erreurs peuvent subsister. Si vous en voyez une, veuillez me la signaler.
Veuillez adresser vos commentaires, remarques, questions, suggestions et remerciements à Paul Timmins
Please see the Frequently Asked Questions page if you have any questions.
Copyright ©2001-2026, Paul Timmins/Timmins Technologies, LLC. All rights reserved
Website Design and User Interface ©2010, Adam Botbyl/Revolutionary Solutions, LLC.
Colocation generously provided by Clear Rate Communications, Inc
Has this site changed your life? Made your job easier? I always love Fanmail and Suggestions.