| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (415) 400-50** | (415) 400-5000 - (415) 400-5098 | 75 |
| (415) 400-51** | (415) 400-5100 - (415) 400-5199 | 78 |
| (415) 400-52** | (415) 400-5200 - (415) 400-5297 | 66 |
| (415) 400-53** | (415) 400-5303 - (415) 400-5398 | 69 |
| (415) 400-54** | (415) 400-5402 - (415) 400-5499 | 75 |
| (415) 400-55** | (415) 400-5506 - (415) 400-5599 | 60 |
| (415) 400-56** | (415) 400-5607 - (415) 400-5699 | 67 |
| (415) 400-57** | (415) 400-5700 - (415) 400-5799 | 67 |
| (415) 400-58** | (415) 400-5804 - (415) 400-5899 | 31 |
| (415) 400-59** | (415) 400-5910 - (415) 400-5998 | 51 |
US Phone Directory: (415) 400-5***
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