Can 6sense identify anonymous website visitors?
6sense resolves anonymous traffic to companies, and states on the record that it does not resolve WebTag data to an individual level.
Companies yes, individuals no — and 6sense is unusually direct about it. Its product page says it "can identify which companies are visiting your site, even if the individual visitors remain anonymous," and its compliance writing states plainly that "6sense does not resolve WebTag data to an individual level."
Last verified: 2026-07-29. Every quote below was read off a 6sense-owned page on that date, with the URL inline.
I'm Dag, co-founder of ContactLevel. We are not a 6sense competitor — we pair with it — so the interesting thing about this page for me is not scoring a point. It is that 6sense has taken a public position most of this category refuses to take, and that position deserves to be quoted accurately rather than spun.
What 6sense says on the record
Two sources, both 6sense's own.
The product page for anonymous visitor identification: "6sense can identify which companies are visiting your site, even if the individual visitors remain anonymous" (6sense.com).
The compliance post, which is more explicit and worth reading in full if you are the person who has to answer a security questionnaire:
"6sense does not resolve WebTag data to an individual level, but instead, as a B2B provider, we identify those companies that are in-market for our customers' products."
And: "6sense does not identify the individuals visiting your website using data collected from our WebTag", "nor do we use our customers' web traffic to create consumer profiles", "or track individual users across the web", and "the 6sense WebTag helps marketers analyze web traffic at a company level — not an individual one" (6sense.com/blog, read 2026-07-29).
That is a policy, not a roadmap gap. It is also, commercially, a feature. Person-level identification carries a harder version of the privacy conversation than account-level does, and deanonymizing website traffic covers why. For scale: in December 2025 the CPPA fined ROR Partners $56,600 for selling custom audience lists without registering as a data broker (CPPA, 2025-12-03). ROR Partners is not a vendor named on this page and no enforcement action against any vendor named here is implied — the point is the environment, not an allegation.
How does 6sense resolve an account without relying on IP?
This is the genuinely interesting engineering answer, and it is why 6sense resolves better than a plain reverse-IP tool.
6sense describes account matching as taking data from your own website and customer database as well as third-party sites, and matching it using IP addresses, device IDs and cookies, with further signals such as channels, product categories and location. It states directly that "the rise in remote work forced vendors to rely on other methods" beyond corporate IP addresses (A Guide to Account Identification, 2026-07-29).
Laid out signal by signal, the gap between what goes in and what comes out is the whole answer to this page's question:
| Signal 6sense ingests | What it can resolve | What it cannot resolve |
|---|---|---|
| IP address | The employer, when the range is registered to them | The employee |
| Device IDs | That the same device returned | Whose device it is |
| Cookies | Session continuity across visits | A name behind the session |
| Channel, product category, location | Which topics an account is researching | Which colleague is doing the researching |
| Your own customer database | Accounts you already know | Strangers |
Every row resolves upward to an organisation. None of them resolves down to a person, which is exactly what 6sense's policy statement says out loud.
On accuracy, 6sense publishes: "Our method has helped us to achieve up to an 85% match accuracy."
Read that number carefully, because it is easy to misuse. It is an account-matching accuracy claim — the share of signals correctly attributed to the right account. It is not the share of your visitors who get a name, because none of them do. Comparing it to RB2B's 15-45% contact-level coverage would be comparing two unrelated measurements, which is the most common mistake in this whole category and the reason B2B match rates exists.
Can 6sense identify anonymous website visitors? The capability table
| 6sense WebTag | Demandbase Account ID | RB2B | ContactLevel | |
|---|---|---|---|---|
| Anonymous IP → company | Yes | Yes | Yes | No |
| Anonymous IP → named person | No — by stated policy | No | Yes, US traffic only | No |
| Requires the person already be in your audience | No | No | No | Yes |
| Geography | Global | Global | Person-level US only | Strongest in the US |
| Signals used | IP, device IDs, cookies, channel, product category, location | IP, cookies, device IDs, third-party IDs, VPN and ZTNA providers | Identity graph on browser/cookie signals | Your own audiences plus identity enrichment |
| Published figure | "Up to an 85% match accuracy" (account matching) | None published | Contact-level 15-20% (Pro), 35-45% (Pro+) | 70-99% list-to-platform match rate |
| Free tier | No | Yes — up to 25K monthly unique visitors | Yes, company-level only | No — 14-day trial, 10,000 contacts |
| Price | Not published; Vendr median $62,440/year | Free tier, then enterprise | $0 / $79 / $149 / $199 per month | $1,000/month entry |
The row to weigh commercially is the last one. 6sense publishes no rate card at all; the $62,440 is a median of 381 analysed purchases reported by the contract broker Vendr in February 2026, not an entry price, and Vendr puts small deployments in the $50,000-$120,000 band. What it buys is a four-part bundle — intent data, predictive scoring, orchestration, activation. If the only job you need done is "which companies are on my site," you are buying an enterprise platform to run a reverse-IP report that three other vendors give away. 6sense pricing breaks the bundle down with the full Vendr figures, and 6sense vs Demandbase covers the head-to-head.
What 6sense is genuinely good at, and what it leaves open
Good at: knowing which accounts are in market before they raise a hand. The intent network is one of the largest in B2B, and the multi-signal account matching holds up better than IP alone in a remote-work world. 6sense's own claim goes further — it says it is "proven to have the highest match rate in the industry" (6sense, 2026-07-29) — which is 6sense's claim, not something I have tested. If your gap is "we don't know which accounts to prioritise," this is squarely what the platform is built for.
Left open, and this is the honest version rather than a swipe:
→ Which human, not which account. An account-level signal tells you Acme is warm. It does not tell you which member of the buying committee to reach, or with what — and there are several. Gartner puts a complex B2B deal at six to ten decision makers; Forrester's 2024 State of Business Buying found an average of 13. That is a contact problem, and buying group marketing is the discipline for it.
→ Activation match rates. 6sense's integrations with Meta, LinkedIn and Google are partnership-based rather than native. Syncing a contact list through an ABM platform hits the same identifier wall a native CSV upload does, for the same reason.
→ Named strangers. By design, forever. If that is your requirement, add an identity-graph vendor — RB2B or Datamoon — on the US slice of your traffic, and accept that a minority of sessions will resolve.
Where ContactLevel fits, and where it does not
Stated plainly: ContactLevel does not identify anonymous net-new website traffic. We name a website visitor only when that person is already in one of your ContactLevel audiences — synced from your CRM, uploaded, or built in-platform. There is no ContactLevel pixel that puts a name on a stranger. If that is the box you need filled, run RB2B, Dealfront or Datamoon upstream.
Where we pair with 6sense is after the signal. 6sense tells you Acme is in market. You then need the buying committee at Acme reachable on the channels they actually use. The obstacle is identifiers: the work email in your CRM is not what LinkedIn, Meta, Google, Reddit or X match on, and nobody signs up to Meta with their work email. Contact-level data enrichment maps the business identity to the personal identifiers those platforms match on, which is how a list moves into the 70-99% range instead of what a raw upload returns.
Then it syncs to LinkedIn, Meta, Google, Reddit and X with role-specific creative per committee member.
On measurement: we report clicks and website visits at the individual person level. We do not report per-person ad impressions. Person-level impression tracking is on the roadmap; it is not in the product today and we are not publishing a date. What we track is the statement of record and it wins any disagreement with a marketing page.
Published pricing is on /pricing: $1,000/month for 10,000 net-new contacts, $3,000/quarter for 50,000, $10,000/year for 200,000. 14-day trial, 10,000 free contacts.
Where to go next
→ Can Demandbase identify anonymous website visitors? — the other enterprise account-ID engine, with a very different data position.
→ 6sense vs Demandbase — the full head-to-head, pricing included.
→ 6sense alternatives — for teams who decide the bundle is not the right fit.
→ Deanonymizing website traffic — why the person-level version of this is a US product, with the 2026 enforcement record.
→ Buying group marketing — what to do once you know the account but need the committee.
→ B2B match rates — why "85% match accuracy" and "15-45% coverage" are not comparable numbers.