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Site Information

whistle.ltd

Link authority for whistle.ltd (registrable domain: whistle.ltd) from the Common Crawl web graph: PageRank and harmonic centrality history since 2017, current scores, and the site's top backlink sources.

10Domain PageRank
44Host Backlinks
53Domain Backlinks
Link authority data (PageRank, harmonic centrality) and backlinks come from the Common Crawl web graph.
whistle_ltd.profile
Current Scores

Web-graph authority (0-100)

Domain scores measure whistle.ltd as a whole: every subdomain's links rolled up into one node of Common Crawl's domain-level web graph. Host scores measure the exact hostname whistle.ltd. WWW scores cover the www variant of that hostname, which the graph tracks as its own entry since January 2026 (before that, www and bare host were merged). A big gap between domain and host usually means the domain's authority lives on other subdomains. PageRank is link-endorsement authority: how much weight the sites linking here carry themselves. Harmonic centrality measures reach: how close this site sits to the rest of the web when following links, which favors broadly connected sites over ones boosted by a few heavy linkers. All are normalized 0 to 100 within each crawl snapshot; a dash means that series does not exist for this site.

10
Domain PageRank
9
Host PageRank
-
WWW PageRank
94
Domain Harmonic Centrality
94
Host Harmonic Centrality
-
WWW Harmonic Centrality
Site Intelligence

Homepage

What whistle.ltd presents on its own homepage: the page title, description, and the social share markup it publishes. Pulled from https://whistle.ltd.

TitleB2B Lead Generation & Outsourced SDR Services | Whistle
DescriptionHire our SDRs or install our full SDR department to grow your B2B pipeline. We handle outreach, tech and analytics so you can focus on revenue.
Site Intelligence

Social accounts and contact points

Where this site maintains a presence and every reachable route its homepage exposes: social accounts, contact pages, addresses, and content feeds.

Site Intelligence

Structured data (JSON-LD)

The schema.org markup this homepage publishes: the machine-readable identity search engines and AI systems read. Types found: Organization, WebSite, FAQPage.

JSON-LD block (1,937 bytes)
{
  "@context": "https://schema.org",
  "@type": "Organization",
  "name": "Whistle",
  "url": "https://www.whistle.ltd",
  "logo": {
    "@type": "ImageObject",
    "url": "https://cdn.prod.website-files.com/68749f974d8457e592380e18/68ec73236872cae46b2c5b29_white.svg"
  },
  "description": "Whistle is a global B2B sales development agency that provides outsourced SDR services and vetted SDR hiring to help startups and scale-ups grow their pipeline.",
  "foundingDate": "2020",
  "founder": [
    {
      "@type": "Person",
      "name": "David Zeff"
    },
    {
      "@type": "Person",
      "name": "Yonah Zeff"
    }
  ],
  "numberOfEmployees": {
    "@type": "QuantitativeValue",
    "minValue": 100
  },
  "contactPoint": [
    {
      "@type": "ContactPoint",
      "telephone": "+1-628-300-0991",
      "contactType": "sales",
      "areaServed": "US",
      "availableLanguage": "English"
    },
    {
      "@type": "ContactPoint",
      "telephone": "+972-33720098",
      "contactType": "sales",
      "areaServed": "IL",
      "availableLanguage": "English"
    },
    {
      "@type": "ContactPoint",
      "telephone": "+61-258500042",
      "contactType": "sales",
      "areaServed": "AU",
      "availableLanguage": "English"
    }
  ],
  "address": {
    "@type": "PostalAddress",
    "streetAddress": "201 Haverstock Hill",
    "addressLocality": "London",
    "addressRegion": "England",
    "postalCode": "NW3 4QG",
    "addressCountry": "GB"
  },
  "sameAs": [
    "https://uk.linkedin.com/company/whistleltd",
    "https://www.facebook.com/callwhistleagency",
    "https://www.youtube.com/@whistleltd/featured",
    "https://www.crunchbase.com/organization/whistle-0297"
  ],
  "knowsAbout": [
    "B2B Lead Generation",
    "Sales Development",
    "Outsourced SDR Services",
    "Cold Calling",
    "Cold Email Outreach",
    "LinkedIn Outreach",
    "Pipeline Generation",
    "RevOps for HubSpot"
  ]
}
JSON-LD block (185 bytes)
{
  "@context": "https://schema.org",
  "@type": "WebSite",
  "name": "Whistle",
  "url": "https://www.whistle.ltd",
  "description": "B2B Lead Generation & Outsourced SDR Services"
}
JSON-LD block (3,003 bytes)
{
  "@context": "https://schema.org",
  "@type": "FAQPage",
  "mainEntity": [
    {
      "@type": "Question",
      "name": "How fast can we get started?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "For our fully managed services, we go live in 10 business days and move fast, from onboarding to first outreach, without sacrificing quality. For our Hire SDR services, we aim to place candidates within five days provided there's no delay from the client."
      }
    },
    {
      "@type": "Question",
      "name": "Can we choose how many outsourced SDRs we need?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Yes. You decide how many reps you need and can scale up or down as your pipeline demands."
      }
    },
    {
      "@type": "Question",
      "name": "Do you only do outbound?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "We specialize in both outbound, inbound and PLG. If you have inbound MQLs that aren't being responded to fast enough, qualified, followed up on or are sitting in your CRM getting cold, we're here to help."
      }
    },
    {
      "@type": "Question",
      "name": "Who handles the messaging and strategy?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Our team does. We craft custom messaging, build sequences, and align with your go to market motion - you just review and approve."
      }
    },
    {
      "@type": "Question",
      "name": "Do you integrate with our CRM?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Yes. We optimize and plug into your CRM so every lead, conversation, and meeting is fully trackable."
      }
    },
    {
      "@type": "Question",
      "name": "Are you responsible for closing deals?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "No. We create qualified sales opportunities and book meetings. Your sales team is responsible for closing."
      }
    },
    {
      "@type": "Question",
      "name": "What makes Whistle different from other SDR agencies?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Unlike a traditional SDR Agency, we don't just throw SDRs at the problem. You get a fully managed sales development function - including strategy, tech stack, data, content, team management, and reporting."
      }
    },
    {
      "@type": "Question",
      "name": "What kind of results should we expect?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "While outcomes vary by segment and volume, most clients see their first meetings within 2–3 weeks of launch."
      }
    },
    {
      "@type": "Question",
      "name": "What does pricing look like?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pricing varies based on scope - whether you're hiring SDRs, running full-service outbound, or need RevOps support. Book a meeting to get a tailored quote."
      }
    }
  ]
}
Web-Graph History

Authority over time

Every Common Crawl web-graph release since 2017, roughly quarterly. The domain series goes back to 2017; Common Crawl only began publishing the host-level graph in 2020, so host lines start there. Click a legend entry to show or hide that line. Flat lines are normal for established sites; watch for sustained rises or drops, which track real gains or losses in who links here.

A note on www: through the end of 2025 the source web graph merged www and non-www hostnames into the bare name, so one host line covers both. Starting in January 2026 the graph splits them into separate entries, which is why www can carry its own scores going forward.

Backlink Data

Backlink counts

Unique linking domains seen in Common Crawl's link graphs. This is a different dataset than the 0-100 authority scores above: these are raw counts, host-level for whistle.ltd and domain-level for whistle.ltd with all its subdomains combined. Common Crawl covers a large sample of the web, not all of it, so treat counts as comparable between sites rather than absolute totals.

44
Host Backlinks
53
Domain Backlinks
Backlink Data

Top backlinks in the domain graph

Common Crawl publishes two link graphs. The DOMAIN graph connects whole domains: every link from any page of one domain to any page of another. This table shows the highest-authority domains linking to whistle.ltd (including its subdomains), ranked by the linker's PageRank. The table shows the top 53; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.

Download domain backlinks (.json)

Backlink Data

Top backlinks in the host graph

The HOST graph connects exact hostnames, so subdomains count separately. This table shows the highest-authority hosts linking to whistle.ltd specifically, ranked by the linker's PageRank. The table shows the top 44; the download carries the full stored list (up to 10,000 linkers) as JSON. Click a linker for its own site profile.

Download host backlinks (.json)