Overview
Validator.nu is a validator bot used for markup validation, accessibility testing, structured-data review, and technical page-quality checks.
Its primary user-agent pattern is Validator.nu; related patterns include Validator.nu/LV.
Validator.nu is Unverified at the identity-evidence level. The listed identity remains useful for detection, but this record does not currently contain authoritative evidence sufficient to authenticate the identity claim.
Robots.txt behavior is not currently confirmed.
Validator.nu can usually be allowed after confirming the source and monitoring request volume.
Identity
- User-Agent
Validator.nu- Aliases
- Validator.nu/LV
- HTTP Agent Examples
Validator.nu- Robots.txt Token
Validator.nu- Identity Type
- Observed
- Evidence Method
- Treat `Validator.nu` as an identity signal only. Confirm it with current operator documentation, cryptographic verification, forward-confirmed reverse DNS, source-network ownership, or other authoritative evidence before trusting the claimed identity.
Classification
- Type
- Validator
- Kind
- Validator
- Family
- Validator.nu
- Purpose
- html-validation
Behavior and handling
- Common Use
- Validator.nu is used for markup validation, accessibility testing, structured-data review, and technical page-quality checks.
- Detection Notes
- Validator.nu traffic is primarily detected by the `Validator.nu` user-agent pattern; related patterns include `Validator.nu/LV`. Compare source IPs, reverse DNS, request paths, and crawl cadence before trusting the traffic.
- Respects robots.txt
- Unknown
- Spoofing Risk
- Validator.nu has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
- Risk
- Neutral
- Recommended Handling
- Allow
Rules and controls
- Robots.txt Snippet
# robots.txt behavior is unconfirmed. Do not rely on this rule without verification.