Yahoo Japan Y!J-ASR

Y!J-ASR

User-agent strings are identity signals, not proof of identity. Confirm the source and behavior before trusting a request.

Verification method: Verify Yahoo Japan Y!J-ASR by matching `Y!J-ASR` to Yahoo Japan Corporation evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.

Yahoo Japan Y!J-ASR traffic is primarily detected by the `Y!J-ASR` user-agent pattern; related patterns include `Y!J-BRJ/YATS crawler; Y!J-BRU/VSIDX; Y!J-BRW; Y!J-BRY/YATSH crawler; Y!J-BRZ/YATSHA crawler; Y!J-B|YJ-SAD; Y!J-MMP/dscv; Y!J-WSC; YJ-SAD`; a representative HTTP user-agent is `Y!J-BRU/VSIDX Y!J-BRW Y!J-ASR Y!J-MMP/dscv Y!J-WSC Y!J-BRJ/YATS crawler Y!J-BRY/YATSH crawler Y!J-BRZ/YATSHA crawler YJ-SAD`. Compare source IPs, reverse DNS, request paths, and crawl cadence with Yahoo Japan Corporation infrastructure before trusting the traffic.

Use this record as identity context. Verify the request source, behavior, and relevance to your site before allowing or restricting traffic.

Yahoo Japan Y!J-ASR is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.

Aliases

Y!J BRJ/YATS Crawler; Y!J BRU/VSIDX; Y!J BRW; Y!J BRY/YATSH Crawler; Y!J BRZ/YATSHA Crawler; Y!J B|YJ SAD; Y!J MMP/dscv; Y!J WSC; YJ SAD

Type

search

Operator

Yahoo Japan Corporation

Family

Yahoo Japan Corporation

Kind

Crawler

Purpose

Indexing

Identity

Verified Bot

Detection confidence

Medium

Spoofing risk

Yahoo Japan Y!J ASR Has Medium Spoofing Risk Because User Agent Strings Can Be Copied; Pair The Match With DNS, IP, Behavior, Or Operator Evidence.

Status

Active

Respects robots.txt

Unknown

Last verified

2026 04 01

User-agent: Y!J-ASR
Disallow: /