AS20559 FUNDAMENTS-AS Fundaments B.V.

FUNDAMENTS-AS Fundaments B.V. · registered in the Netherlands

IPv4 addresses33,53630 prefixes · 0.001% of announced IPv4

Rank in Netherlands#73largest network in NL by IPv4 space, of 1,026 · 0.07% of NL

Rank worldwide#4,694of 79,396 networks with IPv4

IPv619 x /32 (1,245,186 x /48)7 prefixes

CountryNetherlands1,098 ASNs registered there

Open AS20559 in ASN lookup Look up an IP in this network (5.172.40.1) All networks in Netherlands

IPv4 prefixes

All 30 prefixes, in address order.

5.172.40.0/21
31.200.208.0/21
37.220.168.0/21
45.13.164.0/22
45.133.196.0/22
45.146.124.0/22
46.19.216.0/21
46.226.88.0/21
78.31.112.0/21
85.209.108.0/22
88.218.152.0/22
91.197.72.0/22
91.210.127.0/24
91.218.148.0/22
91.224.248.0/23
91.234.193.0/24
93.186.176.0/20
185.46.64.0/22
185.51.56.0/22
185.52.60.0/22
185.113.84.0/22
185.122.116.0/22
185.157.145.0/24
185.202.253.0/24
185.202.254.0/24
193.37.204.0/22
193.187.188.0/22
194.9.85.0/24
194.213.112.0/23
213.249.72.0/24

IPv6 prefixes

All 7 prefixes.

2a00:d10::/32
2a00:d1c0::/32
2a01:448:72::/48
2a02:ac40::/29
2a03:3400::/32
2a06:6940::/29
2a07:3502:1160::/48

Similar-sized networks in Netherlands

ASNNameIPv4 addresses

AS34164#70 AKAMAI-LON Akamai International B.V.34,816

AS1147#71 MCL-AS SURF B.V.34,816

AS51088#72 A2B A2B IP B.V.34,304

AS42707#74 EQuest-AS e-Quest IT-diensten B.V.31,744

AS57112#75 AS-F2X Fiber Services B.V.31,232

AS31477#76 DUOCAST-AS Duocast B.V.30,720

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources