polyfill.io
Category: Information Technology, Suspicious
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Description of polyfill.io
polyfill.io appears to be a long-established technology-related domain associated with JavaScript polyfill delivery, a function commonly used to provide browser compatibility features for older or unsupported web environments. Based on the domain name, classification data, and its historical role on the web, the site appears to sit within the Information Technology category rather than consumer retail or general content publishing.
The available metadata in this scan is limited, with no page title or meta description returned at the time of analysis. Even so, the domain has been registered for many years and is hosted behind a content delivery and protection network, which is consistent with infrastructure often used for high-traffic technical resources. Based on available data, this does not appear to be a parked or for-sale domain.
Safety Assessment for polyfill.io
The scan results indicate a mixed but concerning picture at the time of this scan. Multiple web-classification providers categorized the domain as technology-related, but several also associated it with suspicious or compromised activity. In addition, 10 out of 91 security engines flagged the domain, with verdicts ranging from suspicious to malicious. While blacklist databases were largely clean, one threat database listing and the multi-engine detection pattern suggest that the domain may have been associated with harmful or compromised content during this point-in-time review.
At the same time, not every signal was negative. The malware scan summary reported no flagged files, and major blacklist checks shown in the scan were mostly clean. That kind of split result can happen when a domain is being abused intermittently, when detections are still propagating, or when some scanners are reacting to prior compromise reports rather than currently visible payloads.
Following a manual review by the PCRisk team, the published trust score has been adjusted to 5/100 based on additional context. Based on these findings, this website may pose potential risks to visitors.
Technical Description
The domain is approximately 13 years old, which can be a stabilizing trust factor in isolation, and it is registered through a mainstream registrar. DNS is routed through Cloudflare nameservers, and the resolved IP address also points to Cloudflare infrastructure in Canada. The site presented a valid Let's Encrypt SSL certificate at the time of this scan, expiring on 2026-08-19, which indicates encrypted HTTPS connectivity was available.
A few technical details remain limited or mildly notable. DNSSEC appears to be unsigned, which means DNS responses may not benefit from that additional integrity layer. The web server software and protocol details were not identified in the scan output. No external links, referenced domains, iframes, or flagged files were observed in the provided malware-scan snapshot, so the main technical concern here comes from reputation and threat-intelligence signals rather than from visible page artifacts in this specific crawl.
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