What is an onion site?
An onion site is a website published as a Tor onion service. What its address proves, how to reach one, and why an active site may be missing from every index.
By Dark Web Search editorial · Updated
What is an onion site?
An onion site is a website offered as a Tor onion service. Current v3 service addresses contain a 56-character identifier followed by .onion. This identifier is not a normal brand name that you can reliably recognize at a glance. A familiar-looking prefix does not establish the organization behind the address. Tor’s documentation explains both the addressing mechanism and the browser indicators used for onion services.
How do you access onion sites?
Opening an onion service directly requires Tor-capable software; an ordinary browser cannot reach one on its own. A search index or research service can instead show previously extracted information over the public web, which is a different thing: reading a summary does not mean your browser is connected to that service. Decide which of the two your task needs before choosing a tool, because they differ in freshness, in coverage and in what your own machine connects to.
Check before trusting
Find an official publisher reference, compare the full address and check the date. Similar names, mirrors and copied branding can mislead. Reachability, publisher identity and truth of a statement require separate evidence.
An address-checking example
Suppose a research note says that a publisher offers an onion edition. Keep the publisher’s normal website open as your starting reference, locate its own announcement or access instructions, and compare the complete address in the note. Record where the publisher made that association and when you checked it. If the note and announcement disagree, do not silently choose the address that loads first. The discrepancy is itself a finding. It might reflect an old note, an address change or a false claim. Your conclusion should remain “publisher association unresolved” until there is evidence that explains the difference.
How do you find active onion sites?
Start from the publisher rather than from a keyword, because an index is a selected collection and not a live map of every service: a site can be running and still be absent from it. A useful result should tell you enough about its source and date to distinguish an old record from a present observation. If your question is whether a specific publication has an onion edition, an official publisher statement can be more useful than a broad keyword search. If the source is unavailable, preserve the last known reference and label its current reachability as unknown.
The next action depends on your question
To understand a claim, read the supporting passage. To identify a publisher, check provenance. To diagnose an unavailable site, use the troubleshooting article linked from the blog. These are different next steps; repeating the same search in several tools may simply repeat the same stale reference. You can stop once your original question is answered with adequate evidence.
Primary references
Tor Project: onion servicesThe Tor Project · read · primary source
Tor Project: how onion services workThe Tor Project · primary source
Related help
- What is the dark web?
- Deep web vs dark web: what is the difference?
- Check the publisher before trusting the address
- A browser, a network and a search engine do different jobs
- Searching an index differs from opening an onion site
- Which sources can contribute?
Content revision 2026-09-16. AI-assisted editorial content; check the primary references and their dates.