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What Is Tor (The Onion Router)?

Tor (The Onion Router) is a free, volunteer-run network that hides who is talking to whom by sending traffic through three relays, each of which knows only the hop before and after it. Websites see the IP of the final relay, called the exit node.

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how it works

How onion routing works

The Tor client picks a path, or circuit, of three relays from a public directory: a guard, a middle relay and an exit. It wraps the data in three layers of encryption, one per relay. Each relay peels off its layer and passes the rest on, so the guard knows your IP but not the destination, and the exit knows the destination but not you.

Circuits are reused for a few minutes and then rebuilt. Sites ending in .onion are reached without an exit at all, inside the network. Apps connect to Tor through a local SOCKS5 port, 127.0.0.1:9050 for the Tor service or 9150 for Tor Browser.

  • 1

    Guard (entry)

    Knows
    Your IP address
    Does not know
    Where your traffic is going
  • 2

    Middle

    Knows
    The guard and the exit
    Does not know
    You or the destination
  • 3

    Exit

    Knows
    The destination and unencrypted traffic
    Does not know
    Your IP address
why it matters

Why Tor is not a proxy service

Tor is built for anonymity and censorship resistance, and it is very good at that. It is a poor fit for business proxy work, by design:

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Tor: what it means for you
  • The list of exit relays is public, so many sites challenge or block Tor traffic on sight.
  • Three hops through volunteer relays make it slow, with little control over the exit's country and none over its network type.
  • Exits are shared by many users at once, so their reputation is collective.
  • Its capacity is donated by volunteers; bulk scraping through it is slow, mostly blocked and an unfair load on that capacity.

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Guides from the blog

Setup guides and best practices from the CleanProxies blog.

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Related terms

Terms that come up alongside Tor.

All glossary terms

Tor FAQs

Straight answers about Tor.

The Onion Router, after the layers of encryption that each relay peels away like the skin of an onion.

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