Blacklist monitoring that catches a listing in minutes.

Uptimia watches your domain, web IP and mail IP against 17 spam-blacklist zones around the clock. You find out you're listed — not your customers.

Start free trial → Run a free blacklist check
30-day free trial No credit card GDPR-ready
DNSBL zones
17
Re-check every
15min
Checkpoints
171+
Countries covered
70+

One listing, start to finish

A mail IP turns up on Spamhaus ZEN overnight. Nothing bounces, nothing errors — the mail simply stops arriving.

09:14 Your mail IP answers on Spamhaus ZENCaught on the next scheduled sweep — a monitor-level incident opens emails: vanishing
09:14 Alerted at critical — majors page youThe alert names the list, the resource and the decoded reason emails: vanishing
09:31 You fix, then re-check on demandRelay closed, removal requested — "Re-check all lists" runs ≤ 60 s emails: vanishing
10:02 Delisted — verified, not guessedCleared only after three consecutive clean sweeps; recovery notice sent emails: landing
48 minlisted → verified
Off the list by 10:02.10:02
Most listings are discovered weeks later, from a customer asking where the invoice went. This one lasted 48 minutes — and "delisted" means three clean sweeps agreed, not one hopeful re-check.
list + reason decodedmajors page you, info lists never doverified ×3 clean17 zones · domain + web/mail IPs
And without the sweep? A blacklisted mail IP fails silently — your emails just stop arriving, with no bounce you'd ever see. The discovery is a customer, weeks in: "we never got your invoice." weeks listed

What blacklist monitoring watches for you

One monitor queries 17 DNSBL zones — the same engine as our free Blacklist Checker — sorted into three tiers by real-world impact.

Spamhaus ZENThe big one — critical on listing
Spamhaus DBLYour domain, not just your IP
SpamCop · SURBL · URIBLStandard tier — opens a trouble alert
Mailspike · Hostkarma + 4 more12 standard zones in all
17 dnsbl zones one monitor · three tiers
UCEPROTECTInfo tier — recorded, never pages
PSBL · DroneBL · SpamRatsStandard tier, same sweep
BarracudaMajor tier — a listing pages you
Three tiers decide the noise level: the 3 major zones open a critical incident, the 12 standard zones open a trouble alert, and the 2 info zones are recorded but never page you. tiered by impact

Coverage, severity and diagnostics

Complete coverage

Domain, web IP and mail IP

A blacklisting rarely hits the domain alone — it's usually the IP your mail leaves from. Uptimia watches the whole footprint and re-resolves every address each sweep, so the watch follows you when you switch providers or move servers.

  • The domain, the web IP and the mail IP — found from your A and MX records automatically
  • Up to 5 dedicated sending IPs — add the addresses your ESP or newsletters send from
  • Re-resolved every sweep — change infrastructure and the watch just keeps up
Watch the A and MX records behind them →
caldmont.comadded once
The only thing you type in. Uptimia finds everything that serves and sends for it.
A recordMX record+ your ESP IPs
1 → 4resources
watched
🌐Domaincaldmont.com · as enteredclean
🖥️Web IPA → 203.0.113.10 · autoclean
✉️Mail IPMX → 198.51.100.24 · autolisted
📮Sending IP198.51.100.60 · you addedclean
Switch hosts or mail providers? Every sweep re-resolves your A and MX records first — the watch follows your infrastructure automatically. auto
Severity by impact

Severity that matches real-world impact

Not every blacklist entry is an emergency. Uptimia sorts the registry into three tiers, so a listing that bounces real mail looks nothing like an entry nobody enforces.

  • Major lists page you at critical — Spamhaus ZEN, Spamhaus DBL and Barracuda
  • Info lists are recorded, never alerted — UCEPROTECT L1 and L3 sit quietly in the timeline
  • Whitelist codes decode to clean — a Hostkarma or Mailspike good-reputation answer never pages you
Free tool: check any domain or IP now →
Spamhaus ZENzen.spamhaus.org127.0.0.2
SpamCopbl.spamcop.net127.0.0.2
UCEPROTECT L1dnsbl-1.uceprotect.net127.0.0.2
Hostkarmahostkarma.junkemailfilter.com127.0.0.1
3tiers by
real impact
Same numbers, decodedone sweep
criticalSpamhaus ZEN — pages your team
troubleSpamCop — alerted, calmer tone
infoUCEPROTECT L1 — recorded only
cleanHostkarma — whitelist, good news
127.0.0.1 from a whitelist is praise, not a problem — good-reputation answers decode to clean and never page you. reads clean
Full diagnostics

What's listed, why, and for how long

Instead of seventeen manual dig lookups, the detail page shows every list against every resource, the decoded reason with the operator's raw text, and a transcript of the actual DNS answers — no black box.

  • A tier-grouped wall — every list × every resource, at a glance
  • The raw TXT reason and the decoded return code for every listing
  • A 90-day listing history — how often, how long, and when each cleared
Watch the mail server behind the IP →
LISTEDSpamhaus ZEN × mail IP
198.51.100.24 · reversed → 24.100.51.198 · 09:14 UTC
Q24.100.51.198.zen.spamhaus.org127.0.0.2
Q24.100.51.198.b.barracudacentral.orgNXDOMAIN
Q24.100.51.198.bl.spamcop.netNXDOMAIN
…every other zone, same sweepclean
TXT"Listed, see spamhaus.org/sbl/query"reason
Decoded return code 
127.0.0.2 → SBL — hand-curated
spam source, actively enforced
Operator's raw TXT 
"Listed, see
 spamhaus.org/sbl/query"
90-day history 
2 earlier listings
last cleared Jun 3 · 41 min
No more running dig seventeen times — the tier-grouped wall shows every list × every resource on one page. 17 lists · 1 page
Alerting you already have

Alerts your team can act on

Blacklist alerts ride the same pipeline as the rest of your monitoring — your existing contacts, channels and escalation policies. An open listing escalates on its own.

  • Escalation policies and one-click acknowledgement links — no login needed
  • Grouping and digests — several new listings arrive as one incident, not a storm
  • A recovery notice once every alertable listing has verified clean
Page the next person until someone acknowledges →
Blacklisted — 1 incident09:14
caldmont.com mail IP on Spamhaus ZEN and SpamCop — grouped into one alert, not a storm, on the channels you already use.
SlackEmailSMSPagerDuty+ Teams, WhatsApp…
1
First on-call
paged 09:14 · Slack, SMS and email
unacknowledged
after 5 min the ladder steps up
2
Second on-call
acknowledged 09:20 · one click on a signed link, no login
MTTA 6 m
step 3
3
Engineering lead
never paged — the acknowledgement stopped the ladder
Recovered 10:02 — the delisting is verified clean over three straight sweeps before the all-clear goes to the same channels. No premature good news. verified ×3

How blacklist monitoring works

From a domain to a live monitor in under a minute — nothing to install.

Step 120 seconds

Enter your domain

The web IP and mail-server IP are resolved from your A and MX records automatically. Add up to five dedicated sending IPs if you have them.

Domain
caldmont.com
web IP 203.0.113.10 · mail IP 198.51.100.24 found
Dedicated sending IPs (optional, up to 5)
198.51.100.60
Step 220 seconds

Set the cadence and who's alerted

Choose how often to sweep, then reuse the contacts and channels you already have. The defaults just work.

Sweep every
15 min30 min60 min
Alert via
EmailSlackSMS+ 9 more…
CancelStart monitoring →
Step 3automatic

Get alerted on the next sweep

Each sweep queries all 17 zones. A new alertable listing opens one incident and notifies your team on every chosen channel.

#ops-alerts
Uptimia 08:46
⚠ Blacklisted — caldmont.com web IP
Barracuda · critical203.0.113.10
Also sent to EmailSMSWhatsApp

Where a listing reaches you

A blocklist hit follows the same contact list as an outage — the people who fix mail and DNS hear about it in the same place.

On-call & escalation
PagerDuty Webhooks Twilio
Direct
Email SMS

12 channels, one contact list — a listing pages the same people an outage does.

Browse the full integrations directory →
06:41 · incident opened — send.caldmont.com listed on Spamhaus SBL
#ops-alertsSlack
⚠ Listed — send.caldmont.com · Spamhaus SBL
listed 06:41other lists still cleanAcknowledge ↩
+371 ··· 4082SMS
Uptimia: BLACKLISTED send.caldmont.com is now listed on Spamhaus SBL, first seen 06:41 UTC.
InboxEmail
⚠ Listed — send.caldmont.com on Spamhaus SBL
First seen 06:41. The listing reason and the delisting URL are on the incident, and every other list you watch is still clean…
ProductionPagerDuty
TRIGGEREDListed — send.caldmont.com
assigned to on-call · via Uptimia integration

Add the domain once.Hear about a listing the same hour.

Every blocklist, every IP, every alert channel — free for 30 days, and none of it is a paid add-on.

Start your free 30-day trial →
30 days free no credit card cancel anytime

What is blacklist monitoring?

Blacklist monitoring — also called DNSBL monitoring — is an automated service that repeatedly checks whether your domain and sending IPs appear on spam blacklists, the DNSBLs that mail providers consult before accepting email. When a check finds a listing, it alerts you so removal can start before your deliverability drops.

While you're clean

How does a DNSBL check work?

Uptimia
reversed-IP query
zen.spamhaus.org
Blacklist zone
NXDOMAIN

A DNSBL answers a DNS query for your reversed IP. No answer (NXDOMAIN) means not listed — the same for a domain-kind zone queried as your domain.

When a zone answers

A coded answer means listed

Blacklist zone
127.0.1.2
decoded · DBL
Uptimia
opens the incident

127.0.1.2 → Spamhaus DBL → domain listed → critical, alert sent

The registry

What lists does Uptimia watch?

Seventeen DNSBL zones in three tiers: major lists page at critical, standard lists raise trouble, info lists are recorded but never alert.

Free tool: run all 17 zones once →
TierExample listsSeverityAlerts you?
Major · 3Spamhaus ZEN, Spamhaus DBL, BarracudacriticalYes — right away
Standard · 12SpamCop, SURBL, URIBL, Mailspike, Hostkarma…troubleYes
Info · 2UCEPROTECT L1, UCEPROTECT L3recordedNo — logged only

Blacklist monitoring FAQ

01What is blacklist monitoring?+
An automated spam blacklist monitor that checks whether your domain and sending IPs appear on DNSBLs — the lists mail providers consult before accepting email. Uptimia watches your domain, web IP, mail IP and up to five sending IPs against 17 zones, and alerts you when an alertable listing appears.
02What does Uptimia check — my domain, my IP, or both?+
Both — it's domain and IP blacklist monitoring in one. From your domain, Uptimia resolves and watches the web IP (A record) and mail-server IP (the primary MX — the lowest preference number, which is the one senders try first), plus up to five dedicated sending IPs you add. Every address is re-resolved each sweep, so the watch follows infrastructure changes.
03How often does it check?+
Every 15, 30 or 60 minutes — you choose per monitor (15 is the default). Each sweep repeats the full domain and mail server blacklist check across all 17 zones. DNSBL listings change on the order of minutes to hours, so a scheduled sweep is the right tool. After a fix, "Re-check all lists now" runs within a minute.
04Can Uptimia get me delisted?+
No — delisting is controlled by each blacklist operator. Uptimia detects the listing, decodes the reason and points you to the operator's removal process, then verifies the delisting: it only clears after several consecutive clean sweeps.
05Does this detect malware, phishing or Google Safe Browsing warnings?+
No. Blacklist monitoring covers spam blacklists (DNSBLs) only — not Google Safe Browsing, malware or phishing databases. Our free Blacklist Checker includes a Safe Browsing lookup, and malware scanning is Uptimia's separate Virus Monitoring product.
06Does it support IPv6?+
No — DNSBLs are effectively IPv4-only, so blacklist monitoring watches IPv4 addresses. A resource with only an IPv6 (AAAA) record is marked "not checked (IPv6)" rather than silently reported clean.
07How do you avoid false alarms — and when is a listing really "clear"?+
Good-reputation answers (a Hostkarma or Mailspike whitelist code) decode as clean, and info-tier lists never page you. A listing is only marked resolved after consecutive clean sweeps agree — three by default — and a relist within a week of a verified delisting escalates to critical.
08How many domains can I monitor?+
Blacklist monitoring starts with the paid plans — every paid plan includes it alongside uptime, SSL, DNS and transaction monitoring, never as a paid add-on, and plans differ only in how many domains you can watch (from 1 on Basic up to 100, enough for an agency watching client domains). The free 30-day trial includes it in full (50 domains, no credit card); after the trial, blacklist monitors pause until you're on a plan that includes them, while free-plan uptime monitoring keeps running.
09How do I get alerted when I'm blacklisted?+
Through 12 channels — email, SMS (from your plan's allowance or your own Twilio number), Slack, WhatsApp, Telegram, Discord, PagerDuty, Microsoft Teams, Mattermost, Statuspage and custom webhooks — on the same contact list and escalation policies as every other Uptimia monitor. Alerts group into one incident, escalate if nobody acknowledges, and can be acknowledged with one click on a signed link — no login needed.

Start monitoring your blacklist status today.

Enter a domain, reuse your alert channels — and be the first to know when your mail reputation takes a hit.

Monitor my domain →
30-day free trial No credit card Domain + mail & sending IPs EU-hosted, GDPR-ready
One account, one alerting setup — blacklist monitoring runs alongside your other Uptimia monitors. Or run a one-off check first with the free Blacklist Checker — same engine, no account needed.