415 background january 16-17, 2013 katherine morehouse california public utilities commission
TRANSCRIPT
California Public Utilities Commission (CPUC) Role
• Federal Communications Commission (FCC) holds responsibility on numbering issues
• Area code relief delegated to states• CPUC performs delegated responsibilties and
determines method of introducing new area code• Numbering Administration is performed by the FCC. The
FCC’s role in numbering administration is referred to as the North American Numbering Plan Administration or Administrator (NANPA).
• NANPA tracks number usage, receives numbering reports from the service providers, provides forecasts on the life of area codes and develops alternatives for new area code introduction.
History
• 415 created in 1947 as one of the first area codes in California
• 1959 - 408 and 707 area codes split off from 415.
• 1991- 510 area code split off• 1997 – 650 area code split off• 1999, 628 overlay ordered for 415, which was
suspended when CPUC implemented number conservation.
415 Utilization FactsUtilization Comparison
Available numbers includes only numbers from assigned prefixes. Prefixes and blocks not assigned are not included.
National results are shown from December 2009 because that is the most recent report available.
AssignedAssigned
Percentage
Intermediate, Reserved, Aging
and Administrative Percentage
AvailableAvailable
Percentage
415 as of 6/30/12
4241875 50.3 5.3 3737366 44.3
California as of
6/30/1288,458,148 60 8 48,612,247 33
USA as of 12/31/09
672,472,000 47.9 6.5 639,730,000 45.6
415 Assigned Numbers by Line of Business and by
Rate Center
BelvedereCorte
MaderaIgnacio Inverness Mill Valley Nicasio Point Reyes
Point Reyes
San Rafael SausalitoSan Francisco
Central
San Francisco Juniper
San Francisco Montrose-Evergreen
Stinson-Bolinas
Wireline 36,331 37,988 59,169 23,776 53,627 16,086 70,897 34,552 237,250 56,622 1,677,872 216,364 206,417 19,622 Paging and Messaging 19 2 3,694 21,592 13,574 9
Wireless Telephony 20,425 3,493 1,100 4,677 1,600 46,189 131,160 17,343 1,078,615 45,783 106,027
Telephone Number Structure
• Telephone numbers are made up of area codes, prefixes and line numbers
• Line numbers are assigned to individual telephone services. • Prefixes, also called central office codes, are assigned to groups of
10,000 numbers.• Area codes are the first three digits in the telephone number. Area
codes are assigned to specific geographies within the United States.
Area code Prefix Line Number
415 555 1000
Number Limitations
• Area codes are geographically specific
• Each area code is divided into local serving areas called rate centers
• There are fourteen rate centers in the 415 area code. They are Belvedere, Corte Madera, Ignacio, Inverness, Mill Valley, Nicasio, Point Reyes, Point Reyes, San Rafael, Sausalito, San Francisco Central, San Francisco Juniper, San Francisco Montrose-Evergreen, and Stinson-Bolinas.
• Every prefix is assigned to a specific rate center and may only be used for telephone services in that rate center.
Service Provider Number Inventory
• Every service provider is entitled to numbers to assign to their end users.
• Numbers are assigned in blocks of 1000.
• There are ten blocks in each prefix or code.
Prefix Availability Drives New Area Code
• New area codes are required when the available supply of area code-prefix combinations have been assigned.
• Numerically there are distinct 1000 area code-prefix combinations, but only 800 are usable because prefixes can’t begin with a zero or one.
• Out of the 800 usable prefixes, eighteen are unassignable because they are special use prefixes (2-1-1, 4-1-1, 9-1-1 and others).
• That leaves 782 prefixes available.• Numbers assigned to customers is the greatest reason
prefixes are assigned but the number of service providers in a local area also influences prefix assignments.
Each prefix is assigned to a rate center from the available inventory. Once assigned. Numbers from that prefix are not available for assignment to end users in another rate center.
Mill Valley17
Available 415 prefixes as of 7/1/2012
Belvedere10
Ignacio12
Nicasio5
Sausalito15
SNFC Central
448
SNFC-Mt-Ev
52
Stinson Beach-Bolinas
6
72 unassigned
Corte Madera
11
415 rate centers and assigned prefixes
Novato
18
Point Reyes 7
San Rafael
60
SF Juniper 48
415 Assignment History
• 2007 = 4 prefixes
• 2008 = 2 prefixes
• 2009 = 3 prefixes
• 2010 = 10 prefixes
• 2011 = 21 prefixes
• 2012 = 21 prefixes