ASN lookup result for AS1101 Surf B.V. — network size, BGP routing and registration
IPv4 addresses
1,773,056
16 announced prefixes
IPv6 addresses
7.92 × 10²⁸
3 announced prefixes
BGP neighbours
…
CAIDA rank
#4,235
Customer cone 5 ASNs
Estimated users
178
APNIC Labs estimate
RPKI
79% valid
0 invalid · 4 not covered
Average purity
90
16 sampled IPs
IXPs / facilities
4 / 2
Operator self-reported
History
How prefixes were announced and changed hands, registration changes, and outage or hijack incidents.
Loading routing history…
IP ranges
Currently announced prefixes with their RIR registration and geolocation.
| Prefix | RPKI | Registration | Geolocation | Addresses |
|---|---|---|---|---|
| 145.192.0.0/12 | Valid | — |  Netherlands | 1,048,576 |
| 145.208.0.0/13 | Valid | — | Netherlands | 524,288 |
| 44.137.0.0/16 | Not found | — | Netherlands | 65,536 |
| 145.99.0.0/16 | Valid | SURFNET-EARLY-REGISTRATIONSRIPE | Netherlands | 65,536 |
| 145.220.0.0/16 | Valid | NETSURF-NETRIPE | Netherlands | 65,536 |
| 192.42.128.0/22 | Valid | SURFwimRIPE | Netherlands | 1,024 |
| 145.102.4.0/23 | Valid | Orkaan-NETRIPE | Netherlands | 512 |
| 192.42.118.0/23 | Valid | SURFnetRIPE | Netherlands | 512 |
| 185.17.73.0/24 | Valid | DARKNESS-REIGNSRIPE | Netherlands | 256 |
| 185.100.59.0/24 | Valid | NL-DARKNESS-REIGNS-EFNETRIPE | Netherlands | 256 |
| 192.12.54.0/24 | Not found | IP-EEND-192-12-54RIPE | Netherlands | 256 |
| 192.16.200.0/24 | Not found | SURFwimRIPE | Netherlands | 256 |
| 192.42.117.0/24 | Valid | SURFwimRIPE | Netherlands | 256 |
| 192.42.118.0/24 | Valid | SURFwimRIPE | Netherlands | 256 |
| 192.42.119.0/24 | Valid | SURFwimRIPE | Netherlands | 256 |
| 192.150.94.0/24 | Not found | IP-EEND-192-150-94RIPE | Netherlands | 256 |
/24 block profile
One square per /24: colour shows the risk type, shade how many addresses are flagged, stripes mark datacenter blocks. Click a square to see all 256 addresses.
/24s with data 6 / 6,926 （<1%） · flagged 3
Hover a square for its numbers; click to see all 256 addresses.
Each prefix shows its 64 /24s with the most data. Built daily from lookups, neighbour sampling, public lists and block screening.
IP reputation
IPs from this network that CleanIP has analysed: purity, abuse reports and the riskiest /24 blocks.
Purity distribution
<0.01%
Share of IPv4 reported or blocklisted
131
Listed IPs
16
Analysed IPs
Flagged = VPN, proxy, Tor or purity below 50. Samples come from user lookups and neighbour sampling, not every address in this network.
Geography
Where this network’s IPv4 addresses are located.
- Netherlands100.0%
- Scope
- Single country
- In registered country
- 100.0%
Estimated by sampling IPv4 ranges against a geolocation database.
Traffic observation
AS1101 · Last 7 daysAdoption & Usage
Adoption and usage of key protocols
Security & Attacks
Insights into network and application layer attack traffic
BGP Announcements
Hourly BGP route announcements over the last 7 days
Data: Cloudflare Radar, licensed under CC BY-NC 4.0
Activity
Hourly traffic over the last 7 days, normalized to this network’s peak.
Fairly flat around the clock, typical of server or hosting networks.
| 00 | 06 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| Sun |
- Peak hour
- 02:00–03:00
- Active hours
- 24 hrs
- Weekend vs weekday
- Weekends heavier
- Busiest day
- Sun
Datacenter Presence
WHOIS record
The registry’s record for this AS number: holder, status, dates and contacts.
Related networks
Other ASNs registered in the same country with the same network type.
- AS33915Vodafone Libertel B.V.ISP
- AS6830Liberty Global Europe Holding B.V.ISP
- AS1136Kpn B.V.ISP
- AS50266Odido Netherlands B.V.ISP
- AS31615Odido Netherlands B.V.ISP
- AS47690Tngnet B.V.ISP
- AS15435DELTA Fiber Nederland B.V.ISP
- AS5390Euronet Communications B.V.ISP
- AS12414Solcon Internetdiensten B.V.ISP
- AS41960Nextpertise B.V.ISP
Sources
Where the information on this page comes from and when it was updated.
| Information | Source | Updated |
|---|---|---|
| Registered country | RIR daily delegation statistics | 2026-10-20 |
| Registered address & allocation date | RIR registration data (RDAP) | 2026-10-17 |
| Organization & company country | AS-to-organization data | 2026-10-21 |
| Network type | CleanIP ASN canon | 2026-10-20 |
| Exchanges & facilities | Operator self-reported interconnection data | 2026-10-21 |
| Announced prefixes & BGP neighbours | Public BGP routing data | 2026-10-22 |
| IPv4 geography | Geolocation database | — |
| RPKI validation | RPKI ROA validation data | 2026-10-22 |
| Rank & customer cone | CAIDA AS Rank | 2026-10-01 |
| Estimated users (APNIC) | APNIC Labs user estimates | 2026-10-19 |
| IP reputation | CleanIP lookups and neighbour sampling | — |
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