IONOS, your digital partner for cloud solutions and web hosting, supporting your needs from websites, domains, servers, and more.
Industry
Computers, Electronics and Technology / Web Hosting and Domain Names
Origin
United States
Global rank
#7,464
Rank in United States
#2,504
Updated at
B89.7/100
Security level
Good
Data confidence
High
Scope checked
100%
The higher the score, the more externally observable protections the system has recorded. This page does not certify that the website is reputable, legitimate, or completely free of vulnerabilities.
Is the website “ionos.com” safe?
As of September 20, 2026 at 07:07, ionos.com has a security score of 89.7/100 (grade B: “Good”). CyStack’s automated assessment recorded 8 issues to review after completing 100% of applicable checks. The website owner should address “Allowed browser content (CSP)” first, then review the remaining items in order of impact.
Does ionos.com show known scam, phishing, or malware signals?
At assessment time, CyStack did not find ionos.com or related infrastructure on any scam, phishing, or malware warning list after checking 5 online reputation sources. This result reflects external observations; it does not guarantee absolute safety or verify the organization’s legal status or reputation.
Potentially exposed domain email addressesChecks infostealer data only for email addresses whose domain exactly matches this target. A record is not counted merely because someone visited or signed in to this website.9 matching email exposure records
9Matching email exposure records
7Related infected devices (estimated)
These matching email records were observed previously, but they may already have been addressed or may no longer be valid. The device count estimates infected devices associated with these email records; it is not the number of devices owned by the organization.
Frequently asked questions
What affects the security of ionos.com?
A valid SSL certificate still does not prove that ionos.com is safe, legitimate, or free of scam signals. For a more complete assessment, this report also checks phishing and malware, exposed email records, IPs and open ports, subdomains, technologies, and CVEs that may apply to observed versions.
Does ionos.com use HTTPS, and is its SSL certificate valid?
ionos.com used a valid SSL certificate at assessment time, valid until October 7, 2026. This status may change when the certificate expires or the server configuration changes.
Data compiled from CyStack cybersecurity monitoring systems
CyStack compiles scan results from its internal cybersecurity monitoring systems, including CyStack VulnScan and CyStack Threat Intelligence, together with publicly available Internet data. The assessment only observes and analyzes information already available; it does not attempt unauthorized access, test passwords, send exploit code, or change or disrupt the assessed system.
These 3 failed checks or warnings have the greatest impact on the result for ionos.com.
Allowed browser content (CSP)The CSP on the inspected root HTML response contains a broad, unsafe, or missing script-source control recognized by this bounded check.High
Why it matters
Content Security Policy (CSP) limits where scripts, styles, frames, and other browser content may come from. A strong policy reduces the impact if an attacker manages to inject content into a page.
What to do
Define only the sources the application needs, test the policy before activating it, and avoid broad wildcard (*) rules, unsafe-inline, and unsafe-eval where possible.
Scope of this check
This check only evaluates the homepage response and content that the scanner could reach. Other pages and sign-in flows may use different settings.
Certificate expiry and validityThe certificate is currently valid but expires in 17 day(s), at 2026-10-06T23:59:59Z.High
Why it matters
A certificate works only between its start and expiry dates. An expired, not-yet-valid, or soon-to-expire certificate can trigger browser warnings and interrupt access to the website or API.
What to do
Use automatic renewal, monitor renewal failures, and alert the responsible team well before expiry.
Correct file-type handling (nosniff)The inspected root response does not set X-Content-Type-Options to nosniff.Medium
Why it matters
Without the nosniff setting, a browser may guess a file's type and treat harmless-looking content as executable code. This can turn an incorrect Content-Type into a security issue.
What to do
Send X-Content-Type-Options: nosniff on every response and return an accurate Content-Type.
Leak evidenceMost recent observation:
Email addressRelated infected deviceInfection evidenceRecorded time
Email addressJ****@ionos.comRelated infected deviceB************United StatesIOC reference: IOC-7CF4239E9DInfection evidenceLummaRecorded timeEmail addressC*****@ionos.comRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-E07BDD2576Infection evidenceStealCEmail addressC*********@ionos.comRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-E07BDD2576Infection evidenceStealCEmail addressD********@ionos.comRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-6C3CC92296Infection evidenceStealCEmail addressP****@ionos.comRelated infected deviceNo safely shareable device details are available for this record.IOC reference: IOC-6C3CC92296Infection evidenceStealCEmail addressR*******@ionos.comRelated infected deviceD************* (Windows 11 x32)IrelandIOC reference: IOC-0124015730Infection evidenceEmail addressl*****************@ionos.comRelated infected deviceN***** (Windows 11 24H2 build 26100 (64 Bit))PhilippinesIOC reference: IOC-67061EC561Infection evidenceEmail addressj********************@ionos.comRelated infected deviceA****** (Windows 10 Home Single Language x64)PhilippinesIOC reference: IOC-6AA91FCD7BInfection evidenceEmail addressc******************@ionos.comRelated infected deviceD**************DenmarkIOC reference: IOC-471614FB8DInfection evidence
Data provided by
Discovered subdomains (188+)Subdomains discovered by CyStack, with sensitive-looking names shown first. Availability is verified during this assessment; individual subdomains have not been separately security-tested.Partial
Computers, Electronics and Technology / Web Hosting and Domain Names
Description
IONOS, your digital partner for cloud solutions and web hosting, supporting your needs from websites, domains, servers, and more.
Global rank
#7,464
Rank in United States
#2,504
Rank in industry
#10
Final URL
https://www.ionos.com/
This is a quick, point-in-time check from outside the organization. It can surface visible risks, but it does not replace penetration testing or an authenticated assessment.
Have @ionos.com email addresses appeared in exposed data or information-stealer (infostealer) logs?
There are currently 9 exposed email records matching the ionos.com domain. These records may be old or already resolved. The website owner should verify them before resetting passwords or locking related accounts.
Which public IPs, services, and ports does ionos.com expose?
The assessment observed 2 public IPs and 4 open ports for ionos.com. An open port is not the same as a vulnerability, but the website owner should keep every public service updated and appropriately restrict access.
How many subdomains of ionos.com have been discovered?
The assessment observed 188+ public subdomains of ionos.com. This list can reveal additional entry points such as APIs, administration systems, or test environments, but it does not mean that every subdomain is risky.
Industry
Updated at 
United States
