ZIP Code Validator
ガイド
ZIP Code Validator
Quickly validate US ZIP codes to check if they follow the correct format. This tool supports both standard 5-digit ZIP codes (e.g., 90210) and ZIP+4 codes (e.g., 90210-1234). Enter one or more ZIP codes to instantly see which are valid and which are not.
使い方
- Enter one ZIP code per line in the input field
- Results appear automatically as you type
- Each ZIP code is marked as Valid or Invalid with its format type
- Click “Try an example” to see sample ZIP codes and their validation results
特徴
- Dual Format Support – Validates both 5-digit and ZIP+4 format codes
- 一括検証 – Check multiple ZIP codes at once, one per line
- リアルタイムの結果 – Validation runs automatically as you type
- Clear Summary – See total count of valid and invalid codes at a glance
よくある質問
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What is the difference between a 5-digit ZIP code and a ZIP+4 code?
A 5-digit ZIP code identifies a general delivery area such as a city or town. A ZIP+4 code adds a four-digit suffix separated by a hyphen, which narrows delivery to a specific block, building, or group of addresses within that area.
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Why were ZIP codes introduced in the United States?
ZIP codes were introduced in 1963 by the United States Postal Service to improve mail sorting and delivery efficiency. The acronym ZIP stands for Zone Improvement Plan, reflecting the goal of speeding up mail routing across the country.
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Are all 5-digit number combinations valid ZIP codes?
No. While the format allows any 5-digit combination from 00000 to 99999, the USPS only assigns specific ranges to actual geographic areas. Many combinations are unassigned or reserved and do not correspond to a real delivery location.
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