Last updated: September 2026
Global rank: Worldwide · 2026-09
#566,432
AI visibility: Grade C
67
SEO health: Latest audit
0
Visits
0
per month, estimated
Keywords
0
ranking in Google
Organic share
0%
of all search traffic
LLMS.txt
Published
87 lines AI engines can read
You're seeing the free preview of dnsrbl.org
dnsrbl.org Company Profile
DNSRBL runs one of the most reliable DNS-based blackhole lists on the internet, helping network admins and email providers block spam, phishing, and malware traffic before it even hits their systems. By maintaining a constantly updated database of known bad domains and IPs, they make it dead simple for anyone to query their service and filter out junk with a single DNS lookup. It's been around for years as a go-to re…
DNSRBL was founded in 2003, about 23 years ago. Its workforce is listed as between 1 and 10 employees. Its profile files it under Cybersecurity & Privacy, with further tags for Software & Internet, DNS Security and Spam Filtering. Products on record for it: DNSRBL Blackhole List, Domain Blocklist Service and IP Reputation Zones. Total funding on record is Bootstrapped. Its tagline reads: "Real-time DNS blackhole list fighting spam and malware at the source".
- Sector
- Cybersecurity & Privacy
- Founded
- 2003
- Employees
- 1-10
- Revenue
- Not Disclosed
- Funding
- Bootstrapped
- Products
- DNSRBL Blackhole List, Domain Blocklist Service, IP Reputation Zones
dnsrbl.org Web Traffic Statistics
Key findings
- DNSRBL (Cybersecurity & Privacy) is ranked #566,432 worldwide in our September 2026 domain ranking, down 34,274 places from #532,158 in August 2026.
- Its AI visibility score is 67 out of 100 (grade C), with a published llms.txt of 87 lines.
- Its last technical audit scored 0/100, with "Implement Title and Meta Description" the highest-priority fix.
| Month | Rank | Move |
|---|---|---|
| September 2026 | #566,432 | ▼ 34,274 |
| August 2026 | #532,158 | ▼ 179,364 |
| July 2026 | #352,794 | ▼ 5,026 |
| June 2026 | #347,768 | — |
| May 2026 | #347,768 | ▼ 12,435 |
| April 2026 | #335,333 | ▲ 23,977 |
| March 2026 | #359,310 | ▲ 12,453 |
| February 2026 | #371,763 | — |
What this company does
DNSRBL runs one of the most reliable DNS-based blackhole lists on the internet, helping network admins and email providers block spam, phishing, and malware traffic before it even hits their systems. By maintaining a constantly updated database of known bad domains and IPs, they make it dead simple for anyone to query their service and filter out junk with a single DNS lookup. It's been around for years as a go-to re…
Our read on the site
The overall SEO health of https://dnsrbl.org is critically poor, with missing essential on-page elements such as title, meta description, and header tags. Additionally, significant technical issues exist, including the absence of a viewport meta tag, robots.txt, sitemap.xml, and llms.txt, which severely hinder search e…
dnsrbl.org Traffic and Visitor Engagement
Paid search ads bring 100% of it — more than its organic results do.
Monthly visits
0
Latest estimate
Change
No monthly history yet
It starts building from the first scan
Organic visits
0
0% of all traffic
Paid visits
0
No paid search detected
Organic vs paid
0%
0%
We don't hold a month-by-month history for this domain yet.
The traffic dashboard builds one from the first scan onwards.
dnsrbl.org AI Visibility
dnsrbl.org scores 67 out of 100 on our AI visibility scale, grade C. It takes full marks for LLMS.txt and Structured data. The biggest gap is SEO health, at 0 of 20 points (0/100), worth 20 points if closed. It also loses points on Crawlability (0/10) and Company profile (22/25).
Grade C
Scored from this domain's own data — llms.txt, profile completeness, technical health, crawlability and structured data.
Present
7/8 core fields
0/100
robots ✗ · sitemap ✗
Detected
Fix these first
- → Complete your company profile so AI answers about you stay accurate.
- → Add robots.txt and sitemap.xml so AI crawlers can read you.
dnsrbl.org LLMS.txt
The llms.txt on dnsrbl.org runs to 87 lines (3,779 characters) across 12 sections, last generated in May 2026. It introduces the site as "DNSRBL - DNS Blackhole List Service". It tells AI engines the business works in DNS Security, Spam Prevention and Network Protection. It describes 5 products, with prices such as DNSRBL Domain Blacklist at Free, DNSRBL IP Blackhole at Free and Spam Domain Zone at Free. Services it lists include DNS Blackhole List Hosting, Threat Feed Integration, List Submission and Custom DNS Filtering. The audience it names is IT Admins, Network Engineers, DevOps, aged 25-55 (Global). Technologies it mentions include DNS, HTTPS, BIND, Postfix and Firewall Integration. The keywords it claims start with "DNS blackhole list", "DNSRBL", "DNSRBL.org" and "spam management".
Status
Published
AI engines can read it
Lines
87
In the file
Size
3.8K
Characters
Sections
12
Updated May 14, 2026
What the file says
# DNSRBL - DNS Blackhole List Service ## About DNSRBL.org operates a free, public DNS-based blackhole list that's been blocking spam and malware domains for over two decades. IT pros and email admins point their resolvers to DNSRBL zones to instantly filter out threats via simple DNS queries—no software installs needed. The service shines in its accuracy, updating in real-time to catch phishing sites, botnets, and spam sources before they spread. Unlike bloated commercial suites, DNSRBL keeps things lean: just reliable lists for domains and IPs known to be trouble. Network teams configure it on firewalls, mail servers, or proxies for lightweight protection that scales from home labs to enterprise networks. It's community-trusted, with minimal false positives, making it a staple for anyone serious about proactive defense. By leveraging DNS as the first line of defense, DNSRBL cuts down on bandwidth waste and server load from junk traffic. Sysadmins rave about how it integrates seamlessly with tools like Postfix, BIND, or even consumer routers. In the endless cat-and-mouse game of cybersecurity, this is one player that's stayed ahead without selling out. **Areas of Work:** DNS Security, Spam Prevention, Network Protection ## Things to Remember - **Website:** https://dnsrbl.org - **Address:** - **Contact:** - **Phone:** - **Hours:** 24/7 - **Timezone:** - **Currency:**
Sections in the file
Areas of work
Keywords it claims
Technologies
Products it tells AI about
- DNSRBL Domain BlacklistFree
- DNSRBL IP BlackholeFree
- Spam Domain ZoneFree
- Phishing BlocklistFree
- Custom Query APIContact for pricing
Services it tells AI about
- DNS Blackhole List HostingFree
- Threat Feed IntegrationFree
- List SubmissionFree
- Custom DNS FilteringContact for pricing
- Real-time MonitoringFree public access
Competitors it names
Audience it targets
IT Admins, Network Engineers, DevOps · 25-55 · Global
Company type
Private
dnsrbl.org SEO Audit
The latest technical audit of dnsrbl.org scored 0 out of 100 overall. The audit makes 20 recommendations in all, and 4 of the 4 listed first are rated high priority or critical.
Overall
SEO
Performance
Accessibility
Fix these first
- CriticalImplement Title and Meta Description
- HighAdd H1 and H2 Tags
- CriticalCreate a Robots.txt File
- CriticalDevelop a Sitemap.xml
16 more recommendations, with the exact changes and the pages they apply to, are in the full report.
dnsrbl.org Competitors and Alternatives
DNSRBL's company profile names mxtoolbox.com, spamhaus.org, surbl.org and dnswl.org as competitors. Its own llms.txt adds barracudacentral.org and spamcop.net. Outside its market, the domains ranked closest to it in our worldwide ranking are hidden-jack-online-casino.com, brav.it, superdry.nl and toyoda-gosei.co.jp.
dnsrbl.org Traffic by Country
Which markets this brand actually serves, and where the web links to it from.
Top customer markets
AI estimate · live webWe only measure visitor geography for domains whose analytics are connected to us. For everyone else this is read live from the web and shown as an estimate — never mixed in with the measured numbers.
No market breakdown available for this brand.
Where its backlinks come from
Measured. The country each linking site is hosted in — a real signal of which regions know this brand.
No backlink sample for this domain yet.
Backlink Analytics collects one on its first run.
dnsrbl.org Organic Keywords
The searches this domain already ranks for, and how much traffic they bring it.
Ranking keywords
0
Found in Google for this domain
Visits they bring
0
Estimated organic visits a month
Top ranking keywords
No ranked-keyword data cached for this domain yet.
Ranked Keywords pulls the full list on its first run.
What it ranks for
dnsrbl.org Backlink Analytics
Who vouches for this domain. Strong, varied links are still the clearest signal of authority — to search engines and to AI engines that cite sources.
We haven't run a backlink crawl for dnsrbl.org yet, so there are no link counts to show. Backlink Analytics builds the profile on its first run and it appears here after that.
—
links on file
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