Input a CLLI:

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

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

npa-nxxStateCompanyFRNRMDOCNRate CenterCLLIAssign DateMisc
630-556ILILLINOIS BELL TEL CO (AT&T)N/A9329BIG ROCKBGRKILBGRS000/00/0000Prefix Type: RBOC
Switch Name: BIG ROCK
Switch Type: N/A
LATA: Chicago IL METRO (358)
Tandem: LBRDILLM20T
🔧 Explore Switch(CLLI: BGRKILBGRS0))
630-556 is split into 1,000-number blocks - detail below
630-556-3XXXILILLINOIS BELL TEL CO (AT&T)N/A9329BIG ROCKBGRKILBGRS0N/APrefix Type: RBOC
Switch Name: BIG ROCK
Switch Type: N/A
LATA: Chicago IL METRO (358)
Tandem: LBRDILLM20T
🔧 Explore Switch(CLLI: BGRKILBGRS0))
630-556-4XXXILILLINOIS BELL TEL CO (AT&T)N/A9329BIG ROCKBGRKILBGRS0N/APrefix Type: RBOC
Switch Name: BIG ROCK
Switch Type: N/A
LATA: Chicago IL METRO (358)
Tandem: LBRDILLM20T
🔧 Explore Switch(CLLI: BGRKILBGRS0))
630-556-9XXXILILLINOIS BELL TEL CO (AT&T)N/A9329BIG ROCKBGRKILBGRS0N/APrefix Type: RBOC
Switch Name: BIG ROCK
Switch Type: N/A
LATA: Chicago IL METRO (358)
Tandem: LBRDILLM20T
🔧 Explore Switch(CLLI: BGRKILBGRS0))
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