Deliverability & inbox testing

Sender Score Lookup

Look up a domain or IP's sending reputation from blacklists, reverse DNS and SPF/DMARC, as a transparent 0-100 score. Free — note: not Validity's Sender Score.

Assess sending reputation

Enter an IP or domain. We measure real signals — blacklists, reverse DNS and authentication.

What this tool measures

Combines blacklist, reverse DNS and authentication signals
Checks SPF and DMARC for the domain
Resolves the domain's sending IP and checks it
Scores sending reputation 0-100 transparently
Explains how to improve it with AI
Runs live over DNS — no cached data

Common use cases

  1. 1Estimating a domain's sending reputation
  2. 2Benchmarking before a sending campaign
  3. 3Finding the weakest reputation signal to fix
  4. 4Checking a domain's email standing
  5. 5Auditing a sender you are onboarding
  6. 6Tracking reputation over time

Related tools

IP Reputation CheckerDeliverability Score CheckerEmail Blacklist CheckerSpam Score CheckerSPF Record CheckerDMARC Record Checker

About sender reputation

Sender reputation is how mailbox providers judge your trustworthiness before deciding inbox, spam or reject. The best publicly-measurable inputs are blacklist status, forward-confirmed reverse DNS, and whether you authenticate with SPF, DKIM and DMARC.

This tool computes a transparent score from those real signals. Note it is not Validity's proprietary "Sender Score" (0-100 at senderscore.org), which is based on their own network data — it is an independent, disclosed estimate you can act on immediately.

More Free Tools Where This Came From

This utility is one of dozens of free, no-login tools for DNS, email, SEO and developers — all instant and private.

See All ToolsTalk to Our Team

HostCloud.in  ·  Pune, India  ·  Serving 34,987+ Websites Since 2020

FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

Is this Validity's official Sender Score?

No. The proprietary Sender Score (0-100 at senderscore.org) is based on Validity's private network data and requires their service. This tool computes an independent, transparent score from signals you can verify.

What signals does it use?

Blacklist listings, forward-confirmed reverse DNS, and whether the domain publishes SPF and DMARC — combined into a 0-100 sending reputation score.

How do I raise my sending reputation?

Stay off blacklists, set forward-confirmed reverse DNS, authenticate with SPF, DKIM and DMARC, and send wanted mail to engaged recipients.

Can I look up an IP directly?

Yes. Enter an IP to assess it directly, or a domain to have its sending IP resolved and checked.

Why is my score lower than expected?

A blacklist listing or missing authentication drops the score sharply. The signal list shows exactly which factor is responsible.

Is the lookup live?

Yes. All signals are queried in real time over DNS-over-HTTPS.