APOSTL
Link previews

Blueno

Fetches link-preview information for Naver services.

Operated by Naver
See your agent traffic
PurposeLink previews
HTTP identifierBlueno
IdentityVerify beyond the name

THE SIGNAL

What this visit tells you

Preview retrieval can happen while someone inserts a link in an editor.

Shared URLs
Image responses
Preview fetch errors

Your next move

Test the shared URL’s title and image before changing your preview metadata.

The technical details

Markdown
How to identify it

Look for the Blueno identifier in a request’s User-Agent. This is a name match, not identity verification. Version strings may change.

How to check identity

Use Naver’s current crawler IP information or forward-confirmed reverse DNS under naver.com, as described in Search Advisor.

Access and robots.txt

robots.txt behavior is not established by the linked source. Confirm the current policy before relying on an opt-out.

Seeing 403 or 404 responses?

403 means access was denied; 404 means the resource was not found. Compare the public path, request time, edge security event and origin response to find the cause.

Separate intended restrictions and secret-file probes from pages that should work. A User-Agent name alone does not justify allowing a request.

SourcesReviewed 2026-09-14

Identity and purpose are based on these sources. Analytics interpretation and suggested checks are Apostl guidance.

APOSTL Pulse

See Blueno in context

See their requests. Find the pages that matter.

See your agent traffic

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