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AS42541

Fiberby / Fibercity

Denmark (DK)

ASN Information

AS NumberAS42541
AS NameFIBERBY
OrganizationFIBERBY Fiberby ApS
Also known asFiberby / Fibercity
CountryDenmark (DK)
RegistryRIPE NCC
ASN TypeCable/DSL/ISP
Last Seen
Announcement Count6
IPv4 Prefix Count5
IPv6 Prefix Count1
RPKI StatusValid ×5Unknown (could not be determined) ×1
IRR RecordsView IRR route objects
Websitehttps://fiberby.dk/ ↗

AS Path to AS42541

  1. 58511ANYCAST-GLOBAL-BACKBONE - Anycast Global Backbone
  2. 42541Origin

Most common path, seen 20× in route collector data, latest at a collector in Eugene, OR (2026-10-23 12:38:01 UTC). Prepends collapsed.

Route Collectors (Visibility)

Sydney: 11 peer session(s)São Paulo: 17 peer session(s)Johannesburg: 19 peer session(s)Singapore: 22 peer session(s)Amsterdam: 26 peer session(s)London: 30 peer session(s)Eugene, OR: 55 peer session(s)
High (10+ peers)Medium (3–9)Low (1–2)

Approximate route collector locations, coloured by peer sessions carrying this AS's routes.

Announced Prefixes (6)

View All →
PrefixFamilyRPKILast Seen
89.23.224.0/19IPv4ValidNot looked up yet
185.10.220.0/22IPv4ValidNot looked up yet
193.104.135.0/24IPv4ValidNot looked up yet
193.106.164.0/22IPv4ValidNot looked up yet
194.62.216.0/23IPv4ValidNot looked up yet
2a03:5440::/29IPv6Not checkedNot looked up yet

Peers (173)

View All →
ASNameRelationshipPathsLast Seen
AS3356LEVEL3 - Level 3 Parent, LLCUpstream (inferred)335
AS1299TWELVE99 Arelion Sweden ABUpstream (inferred)55
AS37468Angola Cables - Angola CablesUpstream (inferred)40
AS6939HURRICANE - Hurricane Electric LLCUpstream (inferred)35
AS30844LIQUID-AS Liquid Telecommunications LtdUpstream (inferred)35
AS7713telkomnet-as-ap - PT Telekomunikasi IndonesiaUpstream (inferred)20
AS58511ANYCAST-GLOBAL-BACKBONE - Anycast Global BackboneUpstream (inferred)20
AS137409GSLNETWORKS-AS-AP - GSL Networks Pty LTDUpstream (inferred)20

Neighbours seen next to AS42541 in public AS paths. These are not confirmed BGP sessions; peer IP addresses and locations are not published by these sources.

Public Peering Exchange Points (14)

IX Updates →
ExchangeLocationIPv4IPv6SpeedRS peerUpdated
AMS-IXAmsterdam, NL80.249.212.842001:7f8:1::a504:2541:110GYes
DE-CIX CopenhagenCopenhagen, DK185.0.4.42001:7f8:139::a62d:0:110GYes
DE-CIX FrankfurtFrankfurt, DE80.81.193.642001:7f8::a62d:0:110GYes
DE-CIX HelsinkiHelsinki, FI185.0.5.62001:7f8:13a::a62d:0:110GYes
DE-CIX OsloOslo, NO185.0.7.42001:7f8:13c::a62d:0:110GYes
LOCIX FRANKFURTFrankfurt am Main, DE185.1.167.1432001:7f8:f2:e1:0:4:2541:110GYes
NL-ixAmsterdam, Rotterdam, Brussels, Luxembourg, Frankfurt, Düsseldorf, Berlin, Dublin, London, Copenhagen, Paris, Marseille, NL193.239.118.1062001:7f8:13::a504:2541:120GYes
Netnod Copenhagen BLUE -- MTU9KMalmo / Copenhagen, DK212.237.192.602001:7f8:d:202::6010GYes
Netnod Copenhagen GREEN -- MTU9KMalmo / Copenhagen, DK212.237.193.602001:7f8:d:203::6010GYes
Netnod Stockholm BLUE -- MTU1500Stockholm, SE194.68.128.1782001:7f8:d:fe::17810GYes
Netnod Stockholm BLUE -- MTU4470Stockholm, SE195.69.119.1782001:7f8:d:fb::17810GYes
Netnod Stockholm GREEN -- MTU1500Stockholm, SE194.68.123.1782001:7f8:d:ff::17810GYes
Netnod Stockholm GREEN -- MTU4470Stockholm, SE195.245.240.1782001:7f8:d:fc::17810GYes
STHIX - CopenhagenCopenhagen, DK185.1.88.192001:7f8:b0::4:2541:110GYes

IX ports registered by AS42541 (self-reported by the network).

Interconnection Facilities (4)

FacilityCityCountry
Digital Realty Copenhagen CPH1-3CopenhagenDenmark
GlobalConnect Vesterbro (CPH2)CopenhagenDenmark
TDC Borups AlléCopenhagen NDenmark
GlobalConnect Taastrup 1 (CPH1)TaastrupDenmark

Data centres where AS42541 says it can interconnect (self-reported).

IRR AS-SET and Peering Policy

IRR AS-SETRIPE::AS-FIBERBY
Member of AS-SETsSee IRR page
Peering policyOpen
Multiple locationsNot Required
Ratio requirementNo
ContractNot Required
Traffic100-200Gbps
Traffic ratioMostly Inbound
Geographic scopeRegional
Max prefixes (IPv4 / IPv6)500 / 2000
Unicast / IPv6 / MulticastYes / Yes / No
Looking glasshttps://bgp.tools/lg/42541 ↗
Route serverNot available

Contact Information (2)

RoleNameEmailPhone
PolicyFiberby Peeringpeering@fiberby.net—
AbuseFiberby Abuseabuse@fiberby.net—

Only contacts the network has chosen to publish are shown.

Upstreams (109)

View all →
ASNameRelationshipPathsLast Seen
AS3356LEVEL3 - Level 3 Parent, LLCUpstream (inferred)335
AS1299TWELVE99 Arelion Sweden ABUpstream (inferred)55
AS37468Angola Cables - Angola CablesUpstream (inferred)40
AS6939HURRICANE - Hurricane Electric LLCUpstream (inferred)35
AS30844LIQUID-AS Liquid Telecommunications LtdUpstream (inferred)35
AS7713telkomnet-as-ap - PT Telekomunikasi IndonesiaUpstream (inferred)20
AS58511ANYCAST-GLOBAL-BACKBONE - Anycast Global BackboneUpstream (inferred)20
AS137409GSLNETWORKS-AS-AP - GSL Networks Pty LTDUpstream (inferred)20
AS37100SEACOM Limited - SEACOM LimitedUpstream (inferred)15
AS37497Network Platforms (PTY) LTD - Network Platforms (PTY) LTDUpstream (inferred)15
AS49544i3Dnet i3D.net B.VUpstream (inferred)15
AS1031PEER1-1031 - PEER 1031 LLCUpstream (inferred)10

Downstreams (6)

ASNameRelationshipPathsLast Seen
AS12654—Downstream (inferred)Inferred—
AS19281—Downstream (inferred)Inferred—
AS201697—Downstream (inferred)Inferred—
AS204141—Downstream (inferred)Inferred—
AS205235—Downstream (inferred)Inferred—
AS207727—Downstream (inferred)Inferred—

Registry and network details

Registered holderFIBERBY Fiberby ApS
RegisteredYes
Peering policyOpen
IRR AS-setRIPE::AS-FIBERBY
Registry record last modified
MaintainersRIPE-NCC-END-MNT, FIBERBY
Internet exchanges14
Facilities4
Network profile updated

Data updated . See limitations.