Is My IP Blacklisted? How to Check, Why It Happens, and How to Fix It (2026)

Q: How do I check if my IP is blacklisted?

Run your public IP through a multi-list DNSBL lookup such as the HackMyIP blacklist check or MXToolbox, which checks against over 100 lists, then click through to any list that flags you to see the exact reason. If your connection uses CGNAT, the public IP you share may not be uniquely yours.

Q: What is a DNSBL or RBL?

A DNSBL (DNS blocklist, sometimes called an RBL) is a list of IP addresses published over DNS and defined in RFC 5782. A mail server checks a sending IP by reversing its octets and querying the blocklist zone; an A-record answer such as 127.0.0.2 means listed, and a TXT record gives the reason.

Q: Why is my IP blacklisted?

Common honest reasons include a dynamic IP recycled from a previous spammer, a shared or CGNAT address tainted by another user, a malware or botnet infection on your network, or your residential range being listed on a policy list by design. It does not automatically mean you did anything wrong.

Q: Is being on the Spamhaus PBL bad?

Usually no. The Policy Blocklist lists end-user and residential IP ranges that should not be sending email directly. Spamhaus states these IPs are not necessarily bad, they simply should never send unauthenticated SMTP mail. For a normal home connection, a PBL listing is expected and is not a sign of misconduct.

Q: Does a blacklisted IP mean I was hacked?

Not necessarily. Many listings are about policy or a recycled address rather than compromise. However, appearing on an exploits or botnet list such as Spamhaus XBL can indicate a malware-infected device on your network, which is worth investigating.

Q: What is IP reputation, and is it the same as a blacklist?

IP reputation is a broader, vendor-calculated assessment of an address, often expressed as a score such as Validity Sender Score from 0 to 100. A blacklist is a simple published yes-or-no list. Reputation scores may combine blacklist data with other signals, but the scoring formulas are proprietary and not published.

Q: How do I get my IP removed from a blacklist?

Go to the specific list that flagged you and use its own removal page. Fix the root cause first, because if the underlying issue remains the IP will be relisted. Spamhaus PBL entries can often be self-removed for a legitimate mail server, while SBL or XBL entries usually require the network owner to remediate.

Q: Can I delist my home or ISP IP myself?

Often no. If your address is shared, dynamic, or behind CGNAT, only your ISP or the network owner can resolve the listing. For a normal home user the practical step is to contact your ISP, and delisting is frequently unnecessary because home IPs are not meant to send mail directly.

Q: My VPN IP is blocked by a website. Is that the same as a spam blacklist?

No, that is a different system. Websites and anti-fraud services use VPN, proxy, and datacenter detection plus fraud risk scoring, which flags anonymized traffic. A VPN IP can be clean on mail blocklists like Spamhaus yet still be blocked by a site using proxy detection. Switching VPN servers often resolves it.

Q: Is SORBS still a blacklist I should check?

No. SORBS was decommissioned on June 5, 2024 by its owner Proofpoint and no longer contains reputation data, so any tool still checking SORBS is out of date. Use currently operating lists such as Spamhaus, Barracuda, or SpamCop instead.

~/sheets/is-my-ip-blacklisted.md

Is My IP Blacklisted? The Short Answer
An IP "blacklist" — technically a DNSBL, a DNS-based blocklist — is a published list of IP addresses that mail servers and anti-abuse systems use to reject spam. To find out whether your address is on one, run it through a multi-list checker such as the HackMyIP blacklist check or MXToolbox. If yours is a normal home connection, being on a policy list like the Spamhaus PBL is expected and harmless: it only means your IP is not a designated mail server, not that you did anything wrong.
How IP Blacklists (DNSBLs) Actually Work
A DNSBL (DNS Blocklist, historically called an RBL, Realtime Blackhole List) is standardized in RFC 5782. It is not a website you log into — it is a DNS zone you query. To check 192.0.2.99 against a list hosted at example-bl.org, a checker reverses the octets and appends the zone (99.2.0.192.example-bl.org), then does an ordinary DNS lookup.
An A-record answer means "listed." The answer is a sentinel value in the 127.0.0.x range (conventionally 127.0.0.2), and different values encode which sublist matched. RFC 5782 is explicit that this value must not be treated as a routable IP address.
A TXT record gives the reason — often the exact text a mail server puts in its rejection message (for example, "dynamic address" with a link to the removal page).
Every conforming list must list the test address 127.0.0.2 and must never list 127.0.0.1, so tools can confirm a list is actually live before trusting a "clean" result.
That is why a blacklist check is really a batch of tiny DNS queries, and why a good checker distinguishes "not listed" from "could not reach the list" — a list that refuses public queries is not the same as a clean result.
The Major Blocklists in 2026
These are the lists that actually matter for mail and abuse reputation today. Most are aimed at mail servers, so a listing affects email delivery far more than everyday web browsing.
ListStatus (2026)What it lists
Spamhaus ZEN / SBL / XBL / PBLOperatingOne combined query: spam sources (SBL), malware- or botnet-compromised hosts (XBL), and end-user / residential ranges by policy (PBL)
Barracuda (BRBL)OperatingIP addresses seen sending spam, open relays and proxies, and botnet hosts
SpamCop (SCBL)Operating (Cisco)IPs reported or detected as spam sources; listings are short-lived
UCEPROTECT L1 / L2 / L3OperatingIndividual IPs (L1), network allocations (L2), and whole ASNs (L3)
Validity Sender ScoreOperating (a score, not a DNSBL)A 0-to-100 IP reputation rating (formerly Return Path)
SORBSShut down June 5, 2024Historically proxies, open relays and dynamic ranges — now decommissioned
Freshness note: one very well-known list is gone. SORBS (the Spam and Open Relay Blocking System) was decommissioned on June 5, 2024 by its owner Proofpoint and no longer contains any reputation data. Any blacklist checker that still lists SORBS as a live source is out of date — a reason to prefer a tool that keeps its list current.
Why a Normal or Residential IP Gets Listed
Most people who reach this page have not done anything wrong. The honest reasons a clean user still sees a listing:
Policy listing (normal for home IPs). The Spamhaus PBL deliberately lists end-user and residential ranges. In Spamhaus's own words, these IPs are not necessarily bad — they simply should not be sending unauthenticated SMTP email directly. For a home connection a PBL entry is expected and needs no action.
Recycled dynamic IP. Your ISP may have reassigned an address a previous customer used to send spam. The reputation attaches to the address, not to you, and usually clears over time.
CGNAT or shared address. Behind carrier-grade NAT, many households share one public IP, so another user's behavior can taint the address you all share — and the public IP you see may not even be uniquely yours.
A compromised device. If a clean residential IP you have held for a while suddenly lands on an exploits list such as Spamhaus XBL, that can indicate malware or a botnet on the local network — worth investigating with a breach check and a device scan.
Blacklist vs IP Reputation vs VPN Blocking: Three Different Systems
These get confused constantly, but they are not the same thing:
Mail DNSBLs (Spamhaus, Barracuda, SpamCop) are yes/no lists used by mail servers at connection time. They mainly affect whether your email is delivered.
IP reputation scores (such as Validity's Sender Score, 0 to 100) are a broader, vendor-calculated number that blends complaint data, volume, and list presence. The exact formulas are proprietary and unpublished, so treat any single score as one vendor's opinion. See what an IP reputation score is.
VPN, proxy and fraud detection is a separate world used by websites and anti-fraud systems to flag anonymized, datacenter or shared traffic. This is why a VPN IP can be perfectly clean on Spamhaus yet still hit CAPTCHAs or "access denied" on a site — see why your IP gets flagged as a bot or VPN and test it with the VPN and proxy detector.
How to Check If Your IP Is Blacklisted
Find your real public IP first. Start on the HackMyIP homepage; if you are behind CGNAT, the shared public IP can differ from what your router shows.
Run a multi-list check. The HackMyIP blacklist check queries a set of major abuse DNSBLs and marks each as LISTED, CLEAN, or unavailable (a list that refuses public queries is reported honestly, not as a false "clean"). MXToolbox checks against over 100 lists.
Read the specific list. For any hit, open that list's own lookup page — the authoritative reason and removal steps live there, not in a third-party aggregator.
You can also check any IP as JSON with the free API: GET /api/blacklist?ip=8.8.8.8. And reverse DNS that matches your sending hostname is one of the signals mail servers weigh alongside blocklists.
How to Get Delisted (the Honest Reality)
Fix the root cause first. Remove malware, secure any compromised mailbox, close open relays. If you delist before fixing the cause, the IP is simply relisted.
Use the specific list's removal page. Spamhaus PBL entries can often be self-removed if you legitimately run a static-IP, reverse-DNS-correct mail server; SBL and XBL entries usually require the network owner or ISP to remediate.
Expiry varies by list. Some lists auto-expire after a period with no further abuse — UCEPROTECT, for example, removes an IP seven days after the last detected abuse for free — while others need a manual request. Do not assume a fixed timeline for all of them.
You usually cannot delist a shared or ISP IP yourself. If the address is dynamic, CGNAT, or ISP-owned, only your ISP or the network owner can resolve it. For a normal home user the practical step is to contact your ISP.
A note on pay-to-delist: a few lists (notably UCEPROTECT's higher levels) offer a paid express-delisting option, which is widely criticized. It is optional — you are never required to pay a blacklist to be removed, and major mailbox providers such as Gmail and Microsoft run their own reputation systems rather than relying on the most aggressive lists.
How to Prevent Blacklisting
Keep every device on your network updated and malware-free, use strong unique passwords, and scan for open ports periodically. If you run a mail server, configure SPF, DKIM, and DMARC correctly and keep reverse DNS matching your sending hostname. Run a breach check so a compromised credential does not turn one of your accounts into a spam source.
Frequently Asked Questions
How do I check if my IP is blacklisted?
Run your public IP through a multi-list DNSBL lookup such as the HackMyIP blacklist check or MXToolbox, which checks against over 100 lists, then click through to any list that flags you to see the exact reason. If your connection uses CGNAT, the public IP you share may not be uniquely yours.
What is a DNSBL or RBL?
A DNSBL (DNS blocklist, sometimes called an RBL) is a list of IP addresses published over DNS and defined in RFC 5782. A mail server checks a sending IP by reversing its octets and querying the blocklist zone; an A-record answer such as 127.0.0.2 means listed, and a TXT record gives the reason.
Why is my IP blacklisted?
Common honest reasons include a dynamic IP recycled from a previous spammer, a shared or CGNAT address tainted by another user, a malware or botnet infection on your network, or your residential range being listed on a policy list by design. It does not automatically mean you did anything wrong.
Is being on the Spamhaus PBL bad?
Usually no. The Policy Blocklist lists end-user and residential IP ranges that should not be sending email directly. Spamhaus states these IPs are not necessarily bad, they simply should never send unauthenticated SMTP mail. For a normal home connection, a PBL listing is expected and is not a sign of misconduct.
Does a blacklisted IP mean I was hacked?
Not necessarily. Many listings are about policy or a recycled address rather than compromise. However, appearing on an exploits or botnet list such as Spamhaus XBL can indicate a malware-infected device on your network, which is worth investigating.
What is IP reputation, and is it the same as a blacklist?
IP reputation is a broader, vendor-calculated assessment of an address, often expressed as a score such as Validity Sender Score from 0 to 100. A blacklist is a simple published yes-or-no list. Reputation scores may combine blacklist data with other signals, but the scoring formulas are proprietary and not published.
How do I get my IP removed from a blacklist?
Go to the specific list that flagged you and use its own removal page. Fix the root cause first, because if the underlying issue remains the IP will be relisted. Spamhaus PBL entries can often be self-removed for a legitimate mail server, while SBL or XBL entries usually require the network owner to remediate.
Can I delist my home or ISP IP myself?
Often no. If your address is shared, dynamic, or behind CGNAT, only your ISP or the network owner can resolve the listing. For a normal home user the practical step is to contact your ISP, and delisting is frequently unnecessary because home IPs are not meant to send mail directly.
My VPN IP is blocked by a website. Is that the same as a spam blacklist?
No, that is a different system. Websites and anti-fraud services use VPN, proxy, and datacenter detection plus fraud risk scoring, which flags anonymized traffic. A VPN IP can be clean on mail blocklists like Spamhaus yet still be blocked by a site using proxy detection. Switching VPN servers often resolves it.
Is SORBS still a blacklist I should check?
No. SORBS was decommissioned on June 5, 2024 by its owner Proofpoint and no longer contains reputation data, so any tool still checking SORBS is out of date. Use currently operating lists such as Spamhaus, Barracuda, or SpamCop instead.
Last updated: July 2026

List	Status (2026)	What it lists
Spamhaus ZEN / SBL / XBL / PBL	Operating	One combined query: spam sources (SBL), malware- or botnet-compromised hosts (XBL), and end-user / residential ranges by policy (PBL)
Barracuda (BRBL)	Operating	IP addresses seen sending spam, open relays and proxies, and botnet hosts
SpamCop (SCBL)	Operating (Cisco)	IPs reported or detected as spam sources; listings are short-lived
UCEPROTECT L1 / L2 / L3	Operating	Individual IPs (L1), network allocations (L2), and whole ASNs (L3)
Validity Sender Score	Operating (a score, not a DNSBL)	A 0-to-100 IP reputation rating (formerly Return Path)
SORBS	Shut down June 5, 2024	Historically proxies, open relays and dynamic ranges — now decommissioned