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libpng.org

Category: Information Technology

Scanned: Jul 15, 2026, 08:14 AM UTC · First seen: Jul 15, 2026 · Threat Engines: 0 / 91 · Times Scanned: 1
93 / 100 Trust Score Based on scan findings at the time of analysis
No Threats Found
0 - High Risk50 - Moderate100 - No Threats
Fresh scan recommended
Last scanned 10 days ago - security status may have changed since then.
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Screenshot of libpng.org Captured Jul 15, 2026
https://libpng.org
Screenshot of libpng.org
26 years
Very Popular - #4,516 Tranco rank (>10M monthly visitors)
Not listed (91 checked)
✓ Valid (TLS)
American Internet Services, LLC.
Los Angeles, United States
nginx
Unknown
204.68.111.101
Domain & WHOIS Information
Registrar TUCOWS.COM, CO.
Registered March 10, 2000
Expires March 10, 2027
Name Servers ns1.hover.com
DNSSEC Unsigned
Hosting American Internet Services, LLC.
Reputation & Threat Check 91 security engines checked
File Scan Summary Powered by Quttera Engine
257 files scanned
No threats
252
Low Risk
0
Medium Risk
5
High Risk
0
No threats Low Risk Medium Risk High Risk
libpng.org/pub/mng/index.html 20.2 KB Flagged: medium risk
libpng.org/pub/png/png-sitemap.html 28.9 KB Flagged: medium risk
libpng.org/pub/png/index.html 32.1 KB Flagged: medium risk
libpng.org/pub/png/png.html 32.1 KB Flagged: medium risk
libpng.org/pub/png/png-printable.html 31.6 KB Flagged: medium risk
libpng.org/index.html 2.8 KB No threats
libpng.org/robots.txt 219 B No threats
libpng.org/pub/mng/mng1999.html 6.9 KB No threats
libpng.org/pub/mng/mng2001.html 7.3 KB No threats
libpng.org/pub/mng/mngapmi.html 18.1 KB No threats
libpng.org/pub/mng/mngaptk.html 20.7 KB No threats
libpng.org/pub/mng/mng2002.html 5.8 KB No threats
libpng.org/pub/mng/mngapcv.html 26.5 KB No threats
libpng.org/pub/mng/mngdocs.html 32.1 KB No threats
libpng.org/pub/mng/mng2003.html 5.8 KB No threats
Show 242 more...
Quttera flagged medium risk files - is this your website?
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External Links & Domains
38
External Links
1 Flagged
0
Iframes
Clean
19
Referenced Domains
1 Flagged
2
Flagged Resources
Detected
us.i1.yimg.comFlagged: Generic Suspicious Object
http://us.i1.yimg.com/us.yimg.com/i/us/search/ysan/ysanlogo.gifFlagged: Generic Suspicious Object
http://us.i1.yimg.com/us.yimg.com/i/us/search/ysan/ysanlogo.gifFlagged: Generic Suspicious Object
http://libpng.org/colophon.htmlNot flagged
http://libpng.org/image.pngNot flagged
http://libpng.org/images/next.pngNot flagged
http://libpng.org/images/pngbook-cover.pngNot flagged
http://libpng.org/images/prev-gray.pngNot flagged
http://libpng.org/png-colorappendix.htmlNot flagged
http://libpng.org/png-contents.htmlNot flagged
http://libpng.org/png-crcappendix.htmlNot flagged
http://libpng.org/png-gammaappendix.htmlNot flagged
http://libpng.org/png-rationale.htmlNot flagged
http://libpng.org/png-references.html#b.color-1Not flagged
http://libpng.org/png-references.html#b.color-5Not flagged
http://libpng.org/png-references.html#b.digital-videoNot flagged
http://libpng.org/png-references.html#b.gamma-faqNot flagged
Show 23 more...
us.i1.yimg.comFlagged: Generic Suspicious Object
libpng.orgNot flagged
links.uwaterloo.caNot flagged
pobox.comNot flagged
quest.jpl.nasa.govNot flagged
search.yahoo.comNot flagged
www-mddsp.enel.ucalgary.caNot flagged
www.boutell.comNot flagged
www.brunschen.comNot flagged
www.cs.berkeley.eduNot flagged
www.cs.toronto.eduNot flagged
www.fromme.comNot flagged
www.hpl.hp.comNot flagged
www.libpng.orgNot flagged
www.piclab.comNot flagged
Show 4 more...
libpng.org Overview

Description of libpng.org

libpng.org appears to be the long-running home page for the PNG image format ecosystem, including Portable Network Graphics (PNG), Multiple-image Network Graphics (MNG), and the libpng reference library used for reading and writing PNG files. The page content is technical and informational rather than commercial, and it presents documentation-style links, reference material, and project resources related to image formats and software development.

Based on the page text and metadata, the site appears to be maintained by Greg Roelofs and associated with the broader open-source PNG/libpng project. Its categories from multiple web-classification providers place it in technology and business/information technology, which is consistent with the screenshot showing a simple project homepage for a mature software standard and library.

Safety Assessment for libpng.org

The strongest scan signals are favorable at the time of this scan: 0 out of 91 security engines flagged the domain, and the checked malware/phishing blacklist databases reported clean results. The domain is also very old, has an established traffic rank, and the visible content matches a legitimate technical project site rather than a phishing page, fake store, or other high-risk pattern.

One scanner did report a low-confidence suspicious heuristic on several HTML pages and on a referenced external image domain, but this appears limited and uncorroborated by the broader engine consensus. In this context, a generic heuristic finding may reflect outdated page structure, legacy external references, or conservative pattern matching rather than confirmed malicious behavior. Although one classification source labeled the domain as a parked site, the screenshot clearly shows a functioning project website, so that label may be inaccurate or stale.

Based on available data, no significant threats were detected at the time of this scan.

Technical Description

The site is served over HTTPS with a valid Let's Encrypt certificate that appears current through 2026-09-13. It resolves to IP address 204.68.111.101, uses the nginx web server, and is hosted by American Internet Services, LLC. in Los Angeles, United States. The domain uses ns1.hover.com and ns2.hover.com as nameservers.

DNSSEC appears to be unsigned, which is not uncommon but means DNS responses do not benefit from DNSSEC validation. No major infrastructure-level security issues are evident from the provided scan data, though the site appears to use an older, minimalist web design and includes at least one legacy external reference that triggered a generic heuristic flag.

HTTP Redirect Chain
No redirects detected - direct connection to destination
Website Insights
#4,516
Tranco Rank
Very Popular
Visitors >10M/mo
Category: Information Technology
Rank History (30 days)
Jun 8 Jul 14
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This report was generated automatically and is provided for informational purposes only. Results are based on a point-in-time scan and may contain false positives or incomplete data. This does not constitute a security audit or certification. No vendor in the market can guarantee a 100% detection rate. If you believe this report is inaccurate, please submit a dispute.

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