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Autonomous System

AS20559

Fundaments B.V.

Announced IPs
33,536
CIDR prefixes
30
ASN
AS20559

Reputation · trust score

A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.

53/100
Caution
How this score is built

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

⚠ 1 MOAS prefix — multiple origin ASNs detected

All MOAS anomalies →

A previously stable prefix originated by AS20559 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.

PrefixOrigin ASNsLast detected (UTC)
185.41.136.0/22 AS20559, AS57325 2026-09-12 08:56:01

Network profile

Source: PeeringDB →
Network type Enterprise
Traffic level 5-10Gbps
Geographic scope Europe
Traffic ratio Balanced
Peering policy Open
IRR record RIPE::AS-FUNDAMENTS

Present at 6 internet exchanges: AMS-IX, NL-ix: Main, NDIX, Speed-IX: SPEED-IX, Frys-IX, LSIX: Main

Top CIDR ranges

CIDRIPsPTR DensityOrganizationCountryStateCity
93.186.176.0/20 4.1K
20.6%
Fundaments B.V. NL Overijssel Hengelo
5.172.40.0/21 2.0K
9.1%
Fundaments B.V. NL
31.200.208.0/21 2.0K
6.9%
Fundaments B.V. NL Gelderland Ubbergen
37.220.168.0/21 2.0K
9.6%
Fundaments B.V. NL
46.19.216.0/21 2.0K
9.0%
Fundaments B.V. NL Overijssel Almelo
46.226.88.0/21 2.0K
4.0%
Fundaments B.V. NL Gelderland Alphen
78.31.112.0/21 2.0K
0.0%
Fundaments B.V. NL
45.13.164.0/22 1.0K
0.4%
Fundaments B.V. NL
45.133.196.0/22 1.0K
0.0%
Fundaments B.V. NL
45.146.124.0/22 1.0K
0.0%
Fundaments B.V. NL
85.209.108.0/22 1.0K
4.3%
Fundaments B.V. NL
88.218.152.0/22 1.0K
1.8%
Fundaments B.V. NL
91.197.72.0/22 1.0K
23.8%
Fundaments B.V. NL
91.218.148.0/22 1.0K
4.8%
Fundaments B.V. NL
185.46.64.0/22 1.0K
0.0%
Fundaments B.V. NL
185.51.56.0/22 1.0K
0.0%
Fundaments B.V. NL
185.52.60.0/22 1.0K
74.9%
Fundaments B.V. NL
185.113.84.0/22 1.0K
6.4%
Fundaments B.V. NL
185.122.116.0/22 1.0K
1.8%
Fundaments B.V. NL
193.37.204.0/22 1.0K
9.4%
Fundaments B.V. NL
193.187.188.0/22 1.0K
4.1%
Fundaments B.V. NL
91.224.248.0/23 512
3.9%
Fundaments B.V. NL
194.213.112.0/23 512
0.0%
Fundaments B.V. NL
91.210.127.0/24 256
7.0%
Eurofiber Cloud Infra B.V. NL
91.234.193.0/24 256
0.4%
Fundaments B.V. NL Overijssel Enschede
185.157.145.0/24 256
99.6%
Fundaments B.V. NL
185.202.253.0/24 256
0.4%
Fundaments B.V. NL
185.202.254.0/24 256
0.0%
Fundaments B.V. NL
194.9.85.0/24 256
11.7%
Fundaments B.V. NL
213.249.72.0/24 256
99.6%
Fundaments B.V. NL

BGP Announced Prefixes

Live BGP anomalies →

Prefixes AS20559 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.

PrefixAnnouncement samplesLast seen
91.234.193.0/24 235,767 2026-09-12 08:50:23
185.202.253.0/24 154,781 2026-09-12 08:50:23
185.41.136.0/22 146,462 2026-09-12 08:17:11
185.52.60.0/22 111,046 2026-09-12 08:50:23
91.218.148.0/22 34,795 2026-09-12 08:50:23
91.224.248.0/23 30,936 2026-09-12 08:50:19
91.197.72.0/22 30,661 2026-09-12 08:50:23
45.146.124.0/22 30,656 2026-09-12 08:50:19
185.113.84.0/22 30,547 2026-09-12 08:50:19
31.200.208.0/21 30,236 2026-09-12 08:50:19
88.218.152.0/22 30,116 2026-09-12 08:50:19
85.209.108.0/22 30,103 2026-09-12 08:50:17
193.187.188.0/22 29,892 2026-09-12 08:50:19
185.157.145.0/24 29,760 2026-09-12 08:50:23
185.51.56.0/22 29,723 2026-09-12 08:50:19
45.13.164.0/22 29,723 2026-09-12 08:50:19
185.46.64.0/22 29,687 2026-09-12 08:50:19
45.133.196.0/22 29,267 2026-09-12 08:50:19
78.31.112.0/21 28,749 2026-09-12 08:50:23
193.37.204.0/22 28,619 2026-09-12 08:50:19
194.9.85.0/24 28,554 2026-09-12 08:50:23
93.186.176.0/20 28,316 2026-09-12 08:50:19
37.220.168.0/21 26,957 2026-09-12 08:50:19
213.249.72.0/24 26,239 2026-09-12 08:50:19
185.202.254.0/24 25,774 2026-09-12 08:50:19
5.172.40.0/21 25,180 2026-09-12 08:50:19
46.226.88.0/21 25,134 2026-09-12 08:50:19
46.19.216.0/21 24,946 2026-09-12 08:50:19
185.122.116.0/22 24,910 2026-09-12 08:50:19
91.210.127.0/24 24,281 2026-09-12 08:50:19
194.213.112.0/23 24,188 2026-09-12 08:50:19

Frequently Asked Questions

What is AS20559?

AS20559 is an Autonomous System Number assigned to Fundaments B.V.. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).

How many IP addresses does AS20559 announce?

AS20559 announces 33.5K IPv4 addresses distributed across 30 routed CIDR prefixes. The network is registered in The Netherlands.

Who operates AS20559?

AS20559 is operated by Fundaments B.V.. The organization is based in The Netherlands. You can view all IP ranges and related ASNs on the organization page.

What country is AS20559 registered in?

AS20559 is registered in The Netherlands. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.

Last updated: 2026-09-12 08:55:41 UTC
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