Third call this week, all with that familiar 010 Rotterdam prefix. Still no voicemail, just the persistent ringing followed by silence. It always leaves you wondering: are you missing something genuinely important, or just expertly dodging a chat you’d rather not have right now?
There’s a smarter approach than guessing. Check this phone number using resources that actually understand Dutch telecommunications.
Our reverse phone lookup tools are here to help you get the answers that matter to you: who is calling me from this unfamiliar number? You’ll find concrete details — which telecom provider controls it, what geographic area it’s registered to, whether others have flagged it for suspicious behavior, if it connects to a verifiable Dutch business. The phone number reverse search process checks multiple authoritative sources simultaneously, which is why you’ll often discover information here that basic searches miss entirely.
| Category | Details |
| Country | Netherlands |
| Country Calling Code | +31 |
| National Trunk Prefix | 0 (used before domestic dialing) |
| International Direct Dial (IDD) | 00 (used to call abroad from the Netherlands) |
| Standard Number Format | +31 XX XXX XXXX (international) / 0XX XXX XXXX (domestic) |
| Example Mobile Number | +31 6 1234 5678 (domestic: 06 1234 5678) |
| Example Landline Number | +31 10 123 4567 (domestic: 010 123 4567) |
| Area Codes (Geographic) | 010 (Rotterdam), 020 (Amsterdam), 030 (Utrecht), 040 (Eindhoven), 050 (Groningen) |
| Regulator | Autoriteit Consument & Markt (ACM) |
| Notable Features | Number portability, 06 mobile format, 0800 toll-free, 0900 premium rate, and 085 non-geographic business lines. |
The Basics of Dutch Telephone Number Structure
It’s useful to know who’s calling so you can decide if you want to answer or block the number. The Netherlands has a handy numbering system where the prefix tells you if it’s a mobile, landline, VoIP, or service line (like 0800 or 0900).
For instance, numbers beginning with 06 are mobile phones, while 085 and 088 are often used for business lines. Numbers starting with 0800 are always free to call, but 0900 and 0906 are premium-rate services that can get pricey. Learning these differences can help you steer clear of unwanted costs or potential scams.
What to do:
- Take a look at the first few digits of the number (right after +31 or 0).
- Next, match them to the categories in the table below.
- This will help you figure out if the number is personal, commercial, or service-based.
| Number Type | Prefix / Range | Description |
| Landline (Geographic) | 010–0599 | Fixed lines linked to regions or cities. |
| Mobile | 06 | Mobile networks for personal and business users. |
| VoIP / Business | 085, 088 | Non-geographic lines used by companies and call centers. |
| Toll-Free | 0800 | Free for the caller; commonly used for customer support. |
| Premium-Rate | 0900, 0906, 0909 | Paid services (entertainment, information, or helplines). |
| Machine-to-Machine (M2M) | 097 | Used for connected devices (IoT, security systems). |
| Short Codes | 3–6 digits (e.g., 112, 144) | Used for emergency and public services. |
Dutch Mobile Operators by Prefix
In the Netherlands, all mobile numbers start with 06, but the digits that follow can tell you a lot about the original carrier—even if the person has switched providers. Recognizing these prefixes can help you figure out if a number is legit or a bit dodgy.
For instance, scammers love to spoof 06 numbers to seem local, while VoIP-based scams might use 085 or other foreign-looking prefixes. Knowing the difference can make spotting fake or suspicious numbers much easier.
What to do:
- To figure out the carrier, just look at the first two digits after the “06.”
- Then, match those numbers with the carriers on our list below.
- If you see a number that doesn’t seem to fit, be careful—it could be a spoofed number.
| Prefix (06-XX) | Original Operator | Notes |
| 06-10 to 06-19 | KPN | The largest national mobile network. |
| 06-20 to 06-29 | VodafoneZiggo | One of the main telecom providers in the Netherlands. |
| 06-30 to 06-39 | T-Mobile Netherlands | Strong national coverage. |
| 06-40 to 06-49 | Tele2 / Odido | Merged with T-Mobile in 2023 under Odido. |
| 06-50 to 06-59 | Lebara / Lycamobile | MVNOs popular with prepaid users. |
| 06-60 to 06-69 | Youfone / Simyo | Smaller operators using KPN’s network. |
| 06-70+ | Reserved | Newer allocations or corporate use. |
Landline Area Codes Across the Netherlands
Landline numbers in the Netherlands use geographic area codes that make it easy to identify where a call originated. This can be useful for confirming if a caller really operates from the location they claim.
How to use this table:
- Identify the area code (the first 2–4 digits after 0).
- Compare it with the region listed below.
- Use this information to verify whether the caller’s origin matches their claimed location.
| Area Code | Region / Province | Common Sub-Prefixes | Example Number | Major Cities / Regions |
| 010 | South Holland | 2–9XX | (010) 234 5678 | Rotterdam |
| 020 | North Holland | 3–9XX | (020) 456 7890 | Amsterdam |
| 030 | Utrecht | 3–8XX | (030) 987 6543 | Utrecht City |
| 040 | North Brabant | 2–8XX | (040) 555 4321 | Eindhoven |
| 050 | Groningen | 2–9XX | (050) 321 4567 | Groningen City |
| 070 | South Holland | 2–9XX | (070) 654 9876 | The Hague |
| 072 | North Holland | 2–8XX | (072) 543 6789 | Alkmaar |
| 074 | Overijssel | 2–8XX | (074) 123 4567 | Enschede |
| 076 | North Brabant | 2–8XX | (076) 876 5432 | Breda |
| 080 | Limburg | 2–9XX | (080) 999 8765 | Maastricht |
Best Tools for Reverse Number Lookup in the Netherlands
Reverse lookup tools collect telecom, user-submitted, and business data to help identify unknown callers. These resources can help you verify a phone number, block potential scams, or check for legitimate business listings.
What to do:
- Type the number into one or more lookup tools.
- Compare results from official and user-reported sources.
- Report fraudulent or suspicious numbers when found.
| Tool / Website | Type | Description |
| Scannero.io | Reverse lookup tool | Global number search tool offering spam and carrier detection for Dutch numbers. |
| Nummerzoeker.nl | Public directory | Dutch phone directory for businesses and individuals. |
| Telefoonboek.nl | Business directory | Official national directory for verified Dutch companies. |
| WhoCallsMe.nl | Community | User-driven spam and scam reporting database. |
| Tellows.nl | Community | Local spam rating and number verification service. |
| ACM Telecom Register | Official regulator | Lists officially registered telecom providers and number ranges. |
What Happens During a Reverse Number Lookup
Curious about what happens when you look up an unknown Dutch caller? It’s all about gathering info from various sources that track phone activity across the Netherlands.
Here’s how it unfolds step by step:
- Data is being collected all the time. The ACM (Authority for Consumers and Markets) keeps official lists of which telecom providers own which number ranges. Business directories have company contact details, and community platforms collect reports from people in the Netherlands who flag suspicious callers. Some services even scan public social media profiles for phone numbers.
- Your search activates instant cross-referencing. The moment you enter those digits, search algorithms scan through millions of records—checking telecom allocations, business registrations, geographic patterns, and user-generated warnings. This typically completes within seconds.
- You receive whatever information exists. Sometimes it’s comprehensive: full business name, verified address, provider details. Other times just basics—mobile versus landline, which city, maybe the carrier. Occasionally you’ll only find community warnings like “suspected telemarketing, persistent caller.”
The Truth About Accuracy
Different lookup services show surprisingly different results for the same Dutch number. Here’s why that happens:
- Privacy choices create blind spots. Many people in the Netherlands keep their numbers unlisted intentionally—particularly mobile numbers. These stay anonymous unless registered with businesses or reported by other users.
- Update schedules differ dramatically. One platform might refresh its databases weekly with current ACM data and carrier changes. Another might operate on information that’s months old, showing outdated provider assignments after someone switched from KPN to Vodafone.
- Scammers manipulate what you see. Caller ID spoofing lets fraudsters display fake Dutch numbers—often mimicking banks, PostNL, or local area codes to appear trustworthy. When the displayed number doesn’t match reality, even sophisticated lookup tools hit dead ends.
The key difference between services is data breadth. Basic platforms check one or two sources. Comprehensive tools like Scannero cross-reference ACM registries, business databases, and real-time community reports simultaneously—which explains why they often succeed where simpler services fail.
Typical Dutch Phone Scam and Scam Scenarios
Fraudsters in the Netherlands often mimic legitimate organizations — banks, delivery services, or government agencies — to steal data or money. Recognizing patterns can help you avoid falling victim to these tactics.
| Indicator | Type of Scam/Spam | Example Format | Comment / Recommendation |
| +31 6 numbers impersonating banks | Banking scam | +31 6 2345 6789 | Never share TAN codes or login info by phone. |
| 0800 numbers offering refunds | Phishing scam | 0800 123 4567 | Freephone numbers used by scammers to gain trust. |
| 0906 or 0909 numbers | Premium-rate scam | +31 906 123 456 | Avoid calling back unknown paid numbers. |
| Foreign prefixes (+225, +44, +90) | Callback fraud | +225 678 901 234 | Ignore missed calls from unfamiliar countries. |
| Fake government / tax office calls | Impersonation scam | +31 20 987 6543 | The Belastingdienst never asks for payment by phone. |
| Delivery text scams (PostNL) | Smishing (SMS phishing) | +31 6 555 6789 | Verify delivery links directly through the official PostNL site. |
How to avoid scam and spam calls:
- If someone calls claiming to be from your bank, the Tax Office (Belastingdienst), or the police and asks for money or verification codes, hang up right away! Real Dutch institutions won’t ever ask for payments or sensitive info over the phone.
- Don’t bother calling back missed calls from weird international numbers (like those starting with +225, +234, or +90). These are often “Wangiri scams” trying to trick you into calling back a premium-rate number and racking up huge charges.
- If you get a text or WhatsApp message about a delivery from PostNL, DHL, or anyone else, don’t click those links. Seriously, it’s safer to always track your packages directly on the official website or app.
- Try to avoid calling or texting numbers that start with 0900 or 0906. Unless you’re totally sure about the company, don’t do it! These are premium-rate services that can cost you a ton per minute.
- If you get a call from an “energy provider” or “lottery” offering discounts or prizes, just hang up. These are usually telemarketing or identity theft scams.
Free Public Telephone Directories in the Netherlands
If you prefer to verify numbers manually, these trusted non-commercial directories provide accurate and up-to-date listings.
Use them to:
- Check if a number is tied to a verified business or individual.
- Confirm the legitimacy of a company contact number.
- Cross-check spam reports or suspicious activity.
| Directory | Type | Purpose |
| Telefoonboek.nl | Official Directory | Find registered Dutch businesses and professionals. |
| Nummerzoeker.nl | Public Directory | Verify individual and business contact details. |
| ACM Telecom Register | Regulator | Lists official telecom providers and assigned number ranges. |
| Tellows.nl | Community | User-based reports and spam alerts. |
| WhoCallsMe.nl | Community | Forum-style reports for identifying scam callers. |