Oister.dk (Domain) Investigation Report
Generated on Feb 28, 2026
Why we think so?
Oister.dk is a Danish telecommunications provider with strong local traffic and a secure technical setup. It ranks #78,701 globally and #381 nationally, serving about 485,000 monthly visitors mostly from Denmark. The site uses reputable technologies such as Adobe Analytics and CloudFlare. Its domain was created in 2008, registered with a well-known registrar. Oister publishes several official customer service emails and active social media links. There are no reports of scams or phishing linked to the domain, but a major data breach in mid-2024 exposed customer phone numbers and addresses, affecting approximately 247,000 users. The company has a 3.3/5 rating on a small sample of customer reviews, praising affordability and EU roaming but also noting service delays and coverage limitations. Trademark disputes have been resolved in Oister's favor. Overall, the site demonstrates typical features of a legitimate telecom provider with some data security concerns.
Risk Insights
Established Domain and Tech Setup
- Domain active since 2008 with reputable registrar
- Uses trusted analytics and CDN providers
- Strong monthly traffic primarily from Denmark
Customer Data Breach Noted
- Customer phone numbers and addresses leaked in 2024
- Affects nearly 247,000 users
- Data security improvements recommended
Category Scores
Red Flags & Warnings
- Data breach in June 2024 leaked phone numbers and addresses of approx. 247,000 customers, raising privacy concerns.
- Customer reviews reveal issues with delivery delays and limited international coverage, indicating some service weaknesses.
Detailed Checks & Insights
0-100 Scale
Domain Age and Registrar Check
Score: 90
Domain Age and Registrar Check
"Long domain age and trustworthy registrar reduce risk of fraudulent use."
Reason: The domain oister.dk has been active since 2008 and is registered with CSC Digital Brand Service, a reputable registrar.
Technology and Infrastructure
Score: 85
Technology and Infrastructure
"Presence of paid, reputable services suggests legitimate business operations."
Reason: Use of recognized analytics and CDN providers including Adobe Analytics and CloudFlare indicates professional infrastructure.
Traffic and Audience Analysis
Score: 80
Traffic and Audience Analysis
"Bounce rate and pages per visit metrics are within typical ranges for a telecom site."
Reason: Monthly traffic around 485K with majority Danish visitors supports a genuine and active website audience.
Blacklist and Safety Flags
Score: 95
Blacklist and Safety Flags
"Absence from blacklists confirms no current known malicious activity."
Reason: No blacklists or phishing warnings from Google or crypto scam sources.
Ownership and Contact Transparency
Score: 80
Ownership and Contact Transparency
"Transparency of contact details supports authenticity."
Reason: Multiple official contact emails and verified social media accounts are present on the website.
Trademark and Legal Considerations
Score: 75
Trademark and Legal Considerations
"Legal protections reinforce brand legitimacy."
Reason: Trademark disputes settled favorably with WIPO affirming Oister's rights.
Reputation and Customer Feedback
Score: 70
Reputation and Customer Feedback
"Limited reviews and some complaints suggest cautious optimism."
Reason: Customer reviews reveal mostly positive feedback with some reported service issues; overall rating 3.3/5.
Your Next Steps
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1
Review customer feedback on major review platforms for deeper insight into service quality.
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2
Check for any recent updates or patches related to the 2024 data breach to assess current data security.
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3
Monitor official communications for notices about ongoing improvements or incident resolutions.
Key Evidence & Citations
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SimilarTech domain profile for oister.dk
⤷ Technology used and traffic rank data confirms presence of reputable tools and substantial legitimate traffic.
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Domain Whois Information for oister.dk
⤷ Shows domain registered since 2008, registrar CSC Digital Brand Service recognized for managing trustworthy domains.
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Google Safe Browsing status for oister.dk
⤷ No risk or phishing threats detected.
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Customer reviews summary for oister.dk
⤷ Contains balanced user reviews highlighting cost and customer service alongside delivery and coverage complaints.
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News report on OiSTER data breach
⤷ Significant data leak disclosed in 2024 affecting nearly 250,000 customers.
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