Threat Investigation

ksub.io

High Risk Low Traffic Unranked

ksub.io presents itself as a email service, focusing on marketing automation infrastructure. ksub.io is a technical domain used by the Klaviyo platform to host subscription management pages, preference centers, and tracking links. It serves as a delivery and engagement tracking mechanism for email and SMS marketing campaigns. It claims to be operated by Klaviyo, a subsidiary of Klaviyo, Inc..

marketing automationemail marketingsubscription managementlink tracking
Network Infrastructure

Historical and current IP address mappings for this domain.

Community Intelligence

Real experiences from people who visited this domain

Recent Threat Analysis

URLert analyzed recent scan activity for ksub.io

No public scans recorded recently

Be the first to run a threat analysis on this domain.

Security Considerations

This domain has limited reputation data. Combined with these capabilities, exercise caution.

Custom Subdomains

ksub.io allows users to create custom addresses like "anything.ksub.io". An address like "paypal-secure.ksub.io" may look official but is actually controlled by whoever registered that subdomain—not Klaviyo.

Remember: Exercise caution when interacting with this domain. Verify all content independently.

Developer API

Integrate Domain Intelligence

Access this classification data programmatically via our API.

GET /api/v1/classify?domain=ksub.io
{
  "domain": "ksub.io",
  "confidence": "high",
  "category": {
    "purpose": "email_service",
    "specialization": "Marketing Automation Infrastructure"
  },
  "identity": {
    "headline": "Functional infrastructure domain for Klaviyo marketing automation",
    "summary": "ksub.io is a technical domain used by the Klaviyo platform to host subscription management pages, preference centers, and tracking links. It serves as a delivery and engagement tracking mechanism for email and SMS marketing campaigns.",
    "operator": "Klaviyo",
    "parent_entity": "Klaviyo, Inc.",
    "topics": [
      "marketing automation",
      "email marketing",
      "subscription management",
      "link tracking"
    ]
  },
  "functions": {
    "is_ugc_platform": false,
    "is_file_host": false,
    "is_url_shortener": false,
    "is_public_idp": false,
    "is_crypto_platform": false,
    "allows_user_subdomains": true,
    "is_form_builder": false,
    "is_document_host": false
  },
  "facts": {
    "registered_date": "2021-07-16T21:18:02Z",
    "rank": null,
    "hosting_provider": "CLOUDFLARENET - Cloudflare, Inc."
  }
}

Hosting

CLOUDFLARENET - Cloudflare, Inc.

Registered

Jul 16, 2021

Last Updated

Jan 24, 2026

Domain data sourced from WHOIS, Tranco rankings, and URLert's classification engine.