Technical manuals, such as the HIOS RBIS User Manual , reference "Figure 31: ZIP Code Field" in their documentation of software interfaces.
The uses versioned zip files for technical specifications; for example, Form N-CEN Version 3.1 is provided as a zip file for EDGAR releases. 31.zip
: Security reports from ANY.RUN list various hashes (MD5, SHA256) for this file as of April 2026, marking it as a critical threat to organizations. Other Technical Uses Technical manuals, such as the HIOS RBIS User
In non-malicious contexts, "31.zip" often serves as a shorthand or version-specific filename: Other Technical Uses In non-malicious contexts, "31
: A download for an Adobe script tutorial is hosted as adobe-script-tutorial-31.zip on Mars Premedia . Regulatory & Technical Specs :
: It is associated with Tycoon 2FA , a "phishing-as-a-service" platform designed to bypass multi-factor authentication (MFA) for Microsoft 365 and Gmail accounts.