SURFSARA BV

SURFSARA_BV

Registry

Cluster stats

Netblocks	6 · 2,052 IPv4 addresses
All fragments	20 blocks across 12 clusters
Cluster ID	205484056
Registry	RIPE
Customers	find customers using this network →

Evidence & provenance ?

Attribution	Registry record
Shared handles	clustered on 5 shared RIR contact/maintainer handles
Registry names	2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

Footprint over time

4 weekly snapshots · JSON

6 0 netblocks since 2026-07-05

2026-07-05 peak 6 2026-07-19

IP Ranges (6)

⬇ export CSV

CIDR	Org name	Registry	Status	Confidence
80.252.93.108/30	SURFSARA_BV	RIPE	ASSIGNED PA	● low
94.103.20.80/30	SURFSARA_BV	RIPE	ASSIGNED PA	● low
145.107.8.0/22	SURFsara-NET	RIPE	LEGACY	● low
145.107.56.0/22	SURFsara-NET	RIPE	LEGACY	● low
2001:4d78:500:521::/64	SURFSARA_BV	RIPE	ASSIGNED	● low
2a03:6980:100:3::/64	SURFSARA_BV	RIPE	ASSIGNED	● low

Possibly related to this organisation

what's this?

Same name family

Separately-registered clusters whose names share “SURFSARA” — often per-country or per-system registrations of the same brand, occasionally a different organisation sharing the name. Not counted in this organisation's own footprint.

SURFsara-network 2 blocks
SURFsara-IPv6-NET 2 blocks
SURFsara-SUPER-network 2 blocks
SURFsara-innovation-GPU-at-Nikhef 1 blocks
SURFsara-EGI-network 1 blocks
SURFsara-SOIL-GPUnet 1 blocks
SURFsara-NLeSC-network 1 blocks
SURFsara-EYR-admin-network 1 blocks

Combined view of all 12 name-family clusters →

Sub-allocations under carriers

IP blocks an ISP reassigned to a similarly-named customer — decoded from the ISP's own naming convention, not a direct registration.

SUR Fsara EYR admin network via SURF B.V. sub-allocation

Network trust

what's this?

RPKI hygiene: A how networks compare →

100.0% of checked blocks have valid RPKI ROA coverage (6 of 6)

No discrepancies found among checked blocks.

NIC Handles

DUMY-RIPE DUMY-RIPE EQUINIX-MNT SN-LIR-MNT SURF-AUTO-MNT