Ipv4only.arpa (Domain) Investigation & Evidence Report
Generated on Jan 14, 2026
ipv4only.arpa
http://ipv4only.arpaΒ Why we think so?Β
ipv4only.arpa is a special-use domain name defined by the Internet Engineering Task Force (IETF). It is not a conventional website but part of network infrastructure that helps devices detect IPv6-only networks supporting IPv4 address synthesis. The domain resolves to fixed IPv4 addresses and plays a technical role in DNS64/NAT64 gateway systems, enabling communication between IPv4-only and IPv6-only hosts. It has been in use for over 12 years and shows no signs of web traffic or user engagement as it's not intended for general web browsing.
Risk Insights
Special-use Domain for IPv6 Network Transition
- Defines a technical function in IPv6/IPv4 communication.
- Recognized and standardized by IETF in RFC 8880.
- Not vulnerable to scams or phishing due to non-consumer nature.
Category Scores
Red Flags & Warnings
- No active website, engagement, or contact emails found, which is typical but means no support channels exist.
Detailed Checks & Insights
0-100 Scale
Domain legitimacy and registration
Score: 95
Domain legitimacy and registration
"No registrar abuse or suspicious WHOIS data detected."
Reason: The domain is officially registered with valid authoritative name servers since 2013.
Traffic and engagement analytics
Score: 90
Traffic and engagement analytics
"Zero bounce rate and no traffic sources indicate purely technical use."
Reason: No visits or user engagement found, consistent with a special-use domain not meant for public browsing.
Blacklist and scam detection
Score: 100
Blacklist and scam detection
"Security scans show no threats associated with ipv4only.arpa."
Reason: Not flagged by Google Safe Browsing or crypto scam blacklists; no reported scams or phishing activity.
Trademark conflicts
Score: 85
Trademark conflicts
"USPTO search returned no results for the domain name or close matches."
Reason: No trademarks found that could cause brand impersonation or disputes.
Website contact and support presence
Score: 50
Website contact and support presence
"No social or support channels available, which fits the domain's technical role."
Reason: No contact emails found and phone number appears unrelated; typical for special-use domains.
Public reputation and news
Score: 95
Public reputation and news
"No lawsuits, disputes, or consumer complaints documented."
Reason: No negative news or disputes; community reports confirm normal network behavior with this domain.
Your Next Steps
-
1
No action needed for end users as this domain serves internal network functions.
-
2
If you see frequent queries to ipv4only.arpa in your network logs, understand this is normal behavior for IPv6 transition mechanisms.
-
3
Monitor networks for unexpected traffic to maintain security but consider this domain safe by design.
Key Evidence & Citations
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RFC 8880 - Special-Use Domain "ipv4only.arpa"
⤷ Defines the technical role of ipv4only.arpa in IPv6 transition.
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SimilarWeb traffic data for ipv4only.arpa
⤷ Site shows no user visits or engagement given its infrastructure role.
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WHOIS domain registration data for ipv4only.arpa
⤷ Domain registered since 2013 with standard authoritative name servers.
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