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Mini-guide: testing if your 'dedicated IP' is actually dedicated

Reviews by sven 6 replies 315 views
sven

Member OP

5 #1

Mini-guide since ticket #44891 got escalated again: how to check if your "dedicated IP" is actually dedicated.

  • Step 1: check reverse DNS. If it says contabo.com, you have been workaround'd.
  • Step 2: multirbl.valli.org for blocklists. Dedicated IPs should be clean. If you see sorbs or spamhaus listings from 2019, someone else mailed from it.
  • Step 3: shodan scan. Multiple hostnames = known issue, also known as "not your IP."

As per my last update, I have seen this three times this month. :-|

mediaaustin

Member

Deliverability Nerd

#2
sven said:
Step 1: check reverse DNS. If it says contabo.com, you have been workaround'd.

Hot take: rDNS is the weakest check. For what it's worth, plenty of providers set custom rDNS on shared pools.

Proper method: check the IP against SenderScore and Talos Intelligence. Look for historical SMTP traffic that predates your account creation. If the IP has SPF lookups from domains you do not control, it was previously warm.

Also test direct SMTP to Gmail and Outlook. A truly dedicated IP has no reputation, which means temporary deferrals, not instant inboxing. If you get instant delivery, someone else built that reputation.

SPF, DKIM, DMARC — holy trinity ✉️
RAJ

Member

#3

Guys this is huge for margins. If I am selling "dedicated IP" on my KnownHost reseller account and they are actually shared, I need to know before my email guys complain.

Any leads on which providers actually honor this? HostHatch claims dedicated but I recieved a blacklist notice on day two. Their support said "provisioning error."

This could be a refund case or at least a free month.

your margin is my opportunity
DA

Member

#4

How do I do the shodan thing? Is that a website I visit?

Also if my IP is shared does that mean other people can see my files? Sorry if dumb question

SE

Member

#5

SenderScore is the real test. RDNS gets faked too often

prague1983

Member

btw I use Arch

#6

Temporary deferrals as proof? Some shared pools defer too

oops: 0000 [#1] SMP
MA

Member

#7

Which KnownHost tier gives dedicated IPs

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