AddressLab
Data Methodology and Editorial Standards
How AddressLab creates, reviews, sources, and updates synthetic address test data.
Updated: 2026-11-04
Purpose
AddressLab creates synthetic address-shaped records for software development, QA, form validation, prototypes, demos, and seed data. Records are not identities and are not verified delivery destinations.
Telephone sample boundaries
US samples use the NANPA 555-0100–0199 fictional range with a maintained area-code subset; the address generator supplies phones only for maintained city/area-code pairs and leaves other cities empty. Region-only number examples are not city geolocation. This is not complete city-level coverage. UK samples use Ofcom’s 07700 900000–900999 drama range. Canadian samples also use 555-0100–0199 with a representative province/territory area code. French samples use the Arcep audiovisual range +33 6 39 98 xx xx. Singapore, Netherlands and Spain currently use mobile-format samples, not verified unused numbers. Other countries currently use randomized format samples: they are not verified unused numbers and may overlap real subscribers. Never call, text or use these values for account verification. Sources: https://nanpa.com/numbering/555-line-numbers and https://www.ofcom.org.uk/phones-and-broadband/phone-numbers/numbers-for-drama.
How records are assembled
Each record combines a generated name, phone-format sample, street-format sample, city, region, postal-code style value, country label, and formatted full-address line. City, region, and postal-code examples are maintained as structured test fixtures; street numbers and personal fields are randomized.
Format review
Country pages are reviewed against publicly available postal and addressing guidance. Primary references include USPS Publication 28, Royal Mail addressing guidance, Canada Post addressing guidelines, Japan Post postal-code guidance, and the Universal Postal Union addressing systems resource.
What accuracy means here
AddressLab tests structure and presentation, not deliverability. A city and postal code may follow a real public format while the combined street and identity remain synthetic. The tool must not be used for shipping, identity verification, tax eligibility, or account ownership claims.
Editorial standards
Guides are written for a specific QA task, reviewed for consistency with the live product, and updated when supported fields or workflows change. We avoid publishing copied articles, unverifiable delivery claims, and instructions for bypassing platform controls.
Corrections
Address formats change and test fixtures can contain mistakes. Report a correction with the country, field, expected format, and an authoritative source to support@addresslab.net. Material corrections are reflected in the page's update date.