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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 2026-07-24 16:23:50

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 44,013 2026-07-24 16:19:50
185.41.136.0/22 11,826 2026-07-24 15:47:10
45.146.124.0/22 9,814 2026-07-24 16:19:48
91.224.248.0/23 9,752 2026-07-24 16:19:48
91.197.72.0/22 9,481 2026-07-24 16:19:50
185.113.84.0/22 9,440 2026-07-24 16:19:48
93.186.176.0/20 9,151 2026-07-24 16:04:58
31.200.208.0/21 8,925 2026-07-24 16:19:48
193.187.188.0/22 8,681 2026-07-24 16:19:48
85.209.108.0/22 8,675 2026-07-24 16:19:47
88.218.152.0/22 8,659 2026-07-24 16:19:48
185.51.56.0/22 8,586 2026-07-24 16:19:48
91.218.148.0/22 8,530 2026-07-24 16:19:50
185.46.64.0/22 8,512 2026-07-24 16:19:48
45.13.164.0/22 8,501 2026-07-24 16:19:48
185.157.145.0/24 8,469 2026-07-24 16:19:50
185.122.116.0/22 8,427 2026-07-24 16:04:58
45.133.196.0/22 8,413 2026-07-24 16:19:48
185.52.60.0/22 8,378 2026-07-24 16:19:50
185.202.253.0/24 8,264 2026-07-24 16:19:50
193.37.204.0/22 8,198 2026-07-24 16:19:48
213.249.72.0/24 7,970 2026-07-24 16:04:58
5.172.40.0/21 7,948 2026-07-24 16:04:58
37.220.168.0/21 7,873 2026-07-24 16:04:58
46.226.88.0/21 7,835 2026-07-24 16:04:58
46.19.216.0/21 7,807 2026-07-24 16:04:58
185.202.254.0/24 7,741 2026-07-24 16:04:58
78.31.112.0/21 7,685 2026-07-24 16:19:50
194.9.85.0/24 7,598 2026-07-24 16:19:50
194.213.112.0/23 7,435 2026-07-24 16:04:58
91.210.127.0/24 6,802 2026-07-24 16:17:11

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: 2026-07-24 16:25:32 UTC
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