How do you check if an IP is blacklisted?

Direct answer

To check if an IP is blacklisted, query major DNSBLs and reputation services for your sending IP(s), review recent sending behavior (bounces, complaints), and follow each list’s delisting process after fixing the root cause. Treat this as a deliverability signal, not a single boolean.

Steps

1. Identify which IP sends mail (dedicated vs shared).
2. Run list checks against widely adopted DNSBLs relevant to your recipients.
3. Correlate with SPF/DKIM/DMARC alignment and mail logs.
4. Fix the cause (compromised account, volume spike, bad list purchase) before requesting removal.

Pitfalls

Repeatedly delisting without remediation—lists will relist. Ignoring shared IP neighbor effects on budget providers.

Frequently asked questions

Is one hit a crisis?

Depends on the list’s footprint and your audience. Prioritize providers your customers use.

Does website monitoring replace this?

No—different problem domain; pair with blacklist monitoring for mail reputation.