If you’ve suddenly noticed that your emails aren’t being delivered or your website access is blocked, your IP address might be blacklisted but it’s not permanent.
IP blacklisting can seem alarming, but there’s no need to worry because it’s fixable!
By understanding the cause, following delisting steps, and keeping your systems clean and secure, you can restore your email or website access quickly.
This guide will explain what IP blacklisting means, why it happens, and most importantly, how to fix and prevent it so you can get back online confidently.
What Is IP Blacklisting?
An IP blacklist is a database used by Internet Service Providers (ISPs), email servers, and spam filters to identify and block IP addresses as a result of suspected sending of spam, phishing attempts, or malicious traffic.
When your IP address appears on one of these lists, your emails might bounce back, or your website could become temporarily unreachable.
TIP: Blacklisting doesn’t always mean you’ve done something wrong, so don’t panic! Sometimes, shared servers or infected devices on the same network can certainly cause your IP to be flagged.
Why Is My IP Blacklisted?
This happens when an address is associated with suspicious activity or spam-like behaviour.
Some common causes include:
- Sending bulk or unsolicited emails.
- Using infected devices or compromised email accounts.
- Poor email list hygiene (many invalid recipients).
- Open relays or insecure web forms.
Additionally, common reasons your IP may be blacklisted, and what you can do about them.
1. Spam or Suspicious Email Activity
One of the main reasons an IP address becomes blacklisted is because it’s flagged for sending large volumes of emails that appear suspicious or spam-like. This doesn’t always mean you sent spam intentionally because sometimes, a compromised mailbox or outdated settings can cause the issue.
Common causes include:
- High-volume sending: Sending too many emails in a short time can trigger spam filters.
- Email content issues: Using spam trigger words, suspicious links, or misleading subject lines can cause your IP to be flagged.
- Missing authentication: Without proper SPF, DKIM, and DMARC records, your emails may look unverified, making them more likely to be blocked or spoofed.
IMPORTANT: Make sure your email domain is properly authenticated before sending.
2. Malware or Compromised Accounts
If malware, phishing software, or spam bots are detected on your hosting account, website, or local device, your IP may automatically be blacklisted to protect others on the network but this is certainly not permanent as long as you review and fix.
Common triggers:
- Sending or forwarding viruses or malicious attachments.
- Hosting or linking to phishing content.
- Using outdated or vulnerable plugins or CMS software.
TIP: Run a full antivirus scan on your device and website. Keep your operating system and plugins up to date and use strong passwords to prevent automated logins by bots.
3. Too Many Failed Login Attempts
When someone repeatedly enters incorrect login credentials, whether intentional or not, the system interprets it as a potential attack, so your IP may be temporarily blacklisted to protect your account.
This can happen when:
- You’ve entered the wrong password multiple times.
- A hacker is attempting to gain access through brute-force attacks.
- You’re logging in from multiple devices or unknown locations.
TIP: If your IP is blocked, wait about two hours before trying again, and in the meantime, reset your password.
4. Suspicious or Unusual Network Activity
Monitoring systems constantly track incoming and outgoing connections but if they detect sudden traffic spikes or unusual requests from your IP that could affect server performance, it means that the IP may be temporarily blocked to prevent wider disruption.
Possible causes due to:
- Multiple simultaneous logins.
- High API or FTP activity.
- Automated scripts or bots running in the background.
TIP: Always log out when you’re done managing your account and avoid running multiple FTP connections or backup processes at once.
5. Shared Network or Public Connection Issues
Sometimes, your IP can be blacklisted because of another user on the same network, especially if you’re using public Wi-Fi or shared business internet.
TIP: Avoid logging in from public hotspots or unsecured connections. If you’re working remotely, use a trusted VPN or your home network instead to reduce the risk of shared IP flags.
6. False Positives (Accidental Blocks)
Occasionally, your IP may be blocked by mistake, especially if the traffic pattern resembles an attack. This is rare, but when it happens, it can be fixed quickly.
TIP: Try again in two hours, and if you’re still blocked, consider whitelisting options with your IP address at hand.
Who Is Blacklisting My IP?
There are many reputable organisations (called DNS-based Blacklists, or DNSBLs) that track suspicious or malicious IP behaviour, so it’s important to keep an eye out for these.
Common Blacklist Providers include:
Spamhaus
One of the most well-known providers, Spamhaus, maintains several lists, including the Spamhaus Block List (SBL).
SpamCop
This is another major public blacklist provider that many services use to identify and block spam sources.
Barracuda
Barracuda is another one that provides the Barracuda Reputation Block List (BRBL), which is widely used by email systems to filter spam.
SURBL
Other common providers:
How to Check If Your IP Is Blacklisted
To find out if your IP is blacklisted, you can use any of these tools, as each one allows you to check whether your IP address has been flagged, along with the reason and, concurrently, the source of the blacklist.
1: Visit a trusted lookup tool such as:
- DNSChecker IP Blacklist Check
- MXToolbox Blacklist Check
- WhatIsMyIPAddress Blacklist Check
- Spamhaus Lookup Tool
2: Enter your IP address.
3: Review results and note the reason for blacklisting (if listed).
How to Remove Your IP from a Blacklist
1: Identify the Cause
- Scan your devices and servers for malware or spam scripts.
- Change compromised passwords and secure your hosting environment.
2: Follow the Blacklist’s Delisting Procedure
Each blacklist has a unique removal process, so it is important to clearly understand the handling procedure based on the provider’s Blacklist Delisting Policy and Procedure.
Example:
- Spamhaus provides a removal request form after you correct the issue.
- MXToolbox guides you through contacting the blacklist maintainer.
3: Wait for Propagation
Blacklist removal can take 24 to 72 hours to update globally, depending on the specific blacklist, the cause of the listing, and whether it was an automatic or manual delisting process.
TIP: If your IP is part of a shared server, and you evidently need help, 1-grid Support may need to handle the delisting process on your behalf.
How to Prevent Future Blocks
- Don’t use blacklisted third-party mailers.
- Monitor bounce rates and adjust your sending frequency.
- Use security plugins and firewalls on your hosting account.
- Regularly scan your system for malware.
Anti-Virus Software for Different OS
Here are a few free, high-quality applications that can significantly help you maintain a safe, healthy computer.
Windows
Mac
Linux
If you notice recurring issues, consider upgrading to a Dedicated IP for better control; otherwise, you may see repeated blacklisting.
Tips to Reduce Flags and Maintain Reputation
Keep Excellent Email Hygiene
- Maintain a clean email list.
- Avoid sending bulk emails in a short period of time.
- Monitor spam complaints and address any issues immediately.
- Utilise SPF, DKIM, and DMARC records to authenticate your emails.
- Avoid using spam-like trigger words, suspicious links and subject lines in your emails.
Strengthen your Security Measures
- Run a regular malware scan on all devices connected to your network.
- Use strong passwords.
- Properly configure your firewall if you have one.
- Keep your software and plugins updated.
- Secure your internet connection with strong passwords.
Regularly Check your Blacklist Status
- Check your IP address against common blacklists to identify issues early on.
- Use online blacklist tools to monitor your IP reputation.
When to Contact 1-grid Support
Contact 1-grid Support if:
- You’ve tried delisting steps, and the issue persists.
Provide:
- Your IP address.
- The blacklist provider’s report.
- Any delisting reference number (if applicable).
We’ll review and either guide you further or escalate to the appropriate Network or Mail Administrator if further intervention is required.
FAQs
What is IP blacklisting?
It’s when your IP address is added to a database that flags suspicious or spam activity, causing blocked emails or restricted access.
Why was my IP blacklisted?
Common causes certainly can include sending spam, using infected devices, or sharing a compromised server.
How do I check if my IP is blacklisted?
Use tools like Spamhaus or MXToolbox to check your IP’s status accordingly.
How can I remove my IP from a blacklist?
Fix the issue (malware, email list hygiene), then follow the delisting steps from the blacklist provider.
How long does blacklisting last?
Once you’ve fixed the cause and requested delisting, it usually clears within 24–72 hours.
Can 1-grid help me remove my IP?
Yes, if you’re on a shared server or mail IP, then you can contact us, and we’ll assist with escalation to MailChannels or the appropriate blacklist.
Additional Resources
Everything You Need to Know About an IP Address
What Is My Public IP Address and How Do I Find It?
Email FAQs
Domains FAQs
Choosing a Great Domain Name and Why It Matters for Your Brand Online
Everything You Need to Know About Domains at 1-grid
Get Started with Website Builder at 1-grid
What is Professional Email from 1-grid?
Why SSL? The Purpose of Using SSL Certificates
Everything You Need to Know About DNS for Your Domain
How to Update Your Domain’s Nameservers at 1-grid
Need Additional Support?
We’re Here to Help:
Understanding IP blacklisting and how to resolve this doesn’t have to feel technical with this easy-to-reference guide. Stuck? Contact our Support Team for clarity and guidance (https://1grid.co.za/contact-us/). We’re ready to see how we can help!