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N11 Dialing Codes

Abbreviated dialing codes enable callers to connect to a location in the phone network that would otherwise only be accessible by dialing either a seven or ten-digit telephone number. As a result, the network must be pre-programmed to directly route a three-digit code to the proper destination.  Among abbreviated dialing arrangements, "N11" codes are three-digit codes where the first digit can be any number other than 0 or 1, and the last two digits are both 1.  There are only eight possible N11 codes, making these codes among the scarcest of all numbering resources.  Consequently, the Federal Communications Commission (FCC), which has ultimate authority over the North American Numbering Plan, has been extremely mindful of making sure these three-digit numbers are used for legitimate public interest purposes.  To date, the Federal Communications Commission (FCC) has formally assigned six of the eight possible N11 codes:

  • 211 was assigned in 2000 for community information and referral services.1 
  • 311 was assigned in 1997 for non-emergency police and other government services.2 
  • 411 is currently unassigned but used virtually nationwide for directory assistance. 
  • 511 was assigned in 2000 for traffic and transportation information.3 
  • 611 is currently unassigned but used widely by carriers for repair service. 
  • 711 was assigned in 1997 for access to Telecommunications Relay Services (TRS).4 
  • 811 was assigned in 2005 for access to state One Call Centers (i.e. Diggers Hotline).5 
  • 911 was officially assigned in 2000 for access to emergency services, though it was used widely for this purpose prior to this date.6

Many of these numbers are operational in Wisconsin:

211:  As early as 2001, the Commission first authorized the use of 211 in Wisconsin, addressing this matter on a county or regional basis.  In March 2004, the Commission granted 211 Wisconsin’s petition to oversee the statewide implementation and use of the 211 abbreviated dialing code in Wisconsin to provide comprehensive information and referral services (Docket No. 5-TI-233).  In Wisconsin, telecommunications providers should configure their network to direct all 2-1-1 dialed calls to: 877-947-2211.   Questions regarding this translation may be directed to 211 Wisconsin’s Executive Director, Ms. Charlene Mouille at 608-246-8272, or via e-mail at: cmouille@unitedwaywi.org

511:  In April 2007, the Commission granted the Wisconsin Department of Transportation’s (WisDOT) petition to develop, implement and oversee the use of the 511 abbreviated dialing code in Wisconsin to provide travel-related information (Docket 5-TN-104).  In Wisconsin, telecommunications providers should configure their networks to direct all 5-1-1 dialed calls to: 866-511-9472 (or 866-511-Wisc).  Questions regarding this translation may be directed to the WisDOT State Traffic Operations Supervisor, Mr. Paul Keltner (414-227-2141, Paul.Keltner@dot.wi.gov) or the 511 Program Manager, Mr. Peter Rafferty (608-890-1218, prafferty@wisc.edu).

711:  In 2000, the FCC required  the national implementation of the 711 abbreviated dialing code for access to telecommunications relay services (TRS) for persons with hearing and speech disabilities (The Use of N11 Codes and other Abbreviated Dialing Arrangements, Second Report and Order, CC Docket No. 92-105, released August 9, 2000).  In Wisconsin, telecommunications providers should configure their network to direct all 7-1-1 dialed calls to: 888-350-2565.   Questions regarding this translation may be directed Ms. Emma Danielson at 217-697-4070, or via e-mail at: emma.danielson@sprint.com.   

811: Diggers Hotline did not petition the Commission for designation to serve as Wisconsin’s 811 provider.  However, it was (and continues to be) the only organization performing One Call Notification activities pursuant to Wis. Stat. § 182.0175.  Therefore, in April 2007, the Commission designated Diggers Hotline as the authorized user of the 811 abbreviated dialing code in Wisconsin to provide advanced notice of excavation activities to underground facility operators in compliance with the 2002 Pipeline Safety Improvement Act (Docket 5-TN-105).   In Wisconsin, telecommunications providers should configure their network to direct all 8-1-1 dialed calls to: 877-500-4741.  Questions regarding this translation may be directed to Diggers Hotline Manager of IT Services, Mr. Mike Meyer at 262-785-5329, or via e-mail at: mmeyer@diggershotline.com.

911: Unlike the other N11 codes in Wisconsin, 911 is provisioned on a county-by county basis not on a statewide basis. You may receive a list of the telecommunications providers responsible for coordinating the 911 activities in each county as well as a list of frequently asked questions pertaining to a variety of 911 billing issues..


1  The Use of N11 Codes and other Abbreviated Dialing Arrangements, Third Report and Order and Order on Reconsideration, CC Docket No. 92-105, released July 31, 2000.

2  The Use of N11 Codes and other Abbreviated Dialing Arrangements, First Report and Order, CC Docket No. 92-105, released February 19, 1997.

3  The Use of N11 Codes and other Abbreviated Dialing Arrangements, Third Report and Order and Order on Reconsideration, CC Docket No. 92-105, released July 31, 2000.

4  The Use of N11 Codes and other Abbreviated Dialing Arrangements, First Report and Order, CC Docket No. 92-105, released February 19, 1997.

5  The Use of N11 Codes and other Abbreviated Dialing Arrangements, Sixth Report and Order, CC Docket No. 92-105, released March 14, 2005.

6 The Use of N11 Codes and other Abbreviated Dialing Arrangements, Fourth Report and Order and Third Notice of Proposed Rulemaking, CC Docket No. 92-105, released August 29, 2000.