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AS43037

SEZNAM.CZ

Czechia (CZ)

ASN Information

AS NumberAS43037
AS NameSEZNAM-CZ
OrganizationSEZNAM-CZ Seznam.cz, a.s.
Also known asSEZNAM.CZ
CountryCzechia (CZ)
RegistryRIPE NCC
ASN TypeContent
Last Seen
Announcement Count12
IPv4 Prefix Count6
IPv6 Prefix Count6
RPKI StatusValid ×6Unknown (could not be determined) ×6
IRR RecordsView IRR route objects
Websitehttps://www.seznam.cz ↗

AS Path to AS43037

  1. 58511ANYCAST-GLOBAL-BACKBONE - Anycast Global Backbone
  2. 43037Origin

Most common path, seen 20× in route collector data, latest at a collector in Eugene, OR (2026-10-23 12:37:51 UTC). Prepends collapsed.

Route Collectors (Visibility)

Sydney: 11 peer session(s)São Paulo: 16 peer session(s)Johannesburg: 19 peer session(s)Singapore: 22 peer session(s)Amsterdam: 23 peer session(s)London: 31 peer session(s)Eugene, OR: 56 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 (12)

View All →
PrefixFamilyRPKILast Seen
77.75.72.0/23IPv4ValidNot looked up yet
77.75.74.0/24IPv4ValidNot looked up yet
77.75.75.0/24IPv4ValidNot looked up yet
77.75.76.0/23IPv4ValidNot looked up yet
77.75.78.0/23IPv4ValidNot looked up yet
185.66.188.0/22IPv4ValidNot looked up yet
2a02:598::/32IPv6Not checkedNot looked up yet
2a02:598:2::/48IPv6Not checkedNot looked up yet

Peers (122)

View All →
ASNameRelationshipPathsLast Seen
AS1299TWELVE99 Arelion Sweden ABUpstream (inferred)390
AS29208QUANTCOM-AS Quantcom, a.s.Upstream (inferred)95
AS37468Angola Cables - Angola CablesUpstream (inferred)60
AS5610O2-CZECH-REPUBLIC O2 Czech Republic, a.s.Upstream (inferred)45
AS6939HURRICANE - Hurricane Electric LLCUpstream (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 AS43037 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 (3)

IX Updates →
ExchangeLocationIPv4IPv6SpeedRS peerUpdated
DE-CIX FrankfurtFrankfurt, DE80.81.196.1312001:7f8::a81d:0:1—Yes
NIX.CZPrague, CZ91.210.16.1942001:7f8:14::36:1100GYes
NIX.CZPrague, CZ91.210.16.1952001:7f8:14::36:2100GYes
NIX.CZ FENIXPrague, CZ194.50.100.1942001:7f8:14:5ec::36:1100GYes
NIX.CZ FENIXPrague, CZ194.50.100.1952001:7f8:14:5ec::36:2100GYes

IX ports registered by AS43037 (self-reported by the network).

Interconnection Facilities (0)

No interconnection facilities are registered for AS43037.

Data centres where AS43037 says it can interconnect (self-reported).

IRR AS-SET and Peering Policy

IRR AS-SETAS-SEZNAM-CZ
Member of AS-SETsSee IRR page
Peering policyOpen
Multiple locationsNot Required
Ratio requirementNo
ContractNot Required
Traffic100-200Gbps
Traffic ratioHeavy Outbound
Geographic scopeEurope
Max prefixes (IPv4 / IPv6)7 / 7
Unicast / IPv6 / MulticastYes / Yes / No
Looking glassNot available
Route serverNot available

Contact Information (1)

RoleNameEmailPhone
NOCNOC/Peeringnoc@firma.seznam.cz—

Only contacts the network has chosen to publish are shown.

Upstreams (78)

View all →
ASNameRelationshipPathsLast Seen
AS1299TWELVE99 Arelion Sweden ABUpstream (inferred)390
AS29208QUANTCOM-AS Quantcom, a.s.Upstream (inferred)95
AS37468Angola Cables - Angola CablesUpstream (inferred)60
AS5610O2-CZECH-REPUBLIC O2 Czech Republic, a.s.Upstream (inferred)45
AS6939HURRICANE - Hurricane Electric LLCUpstream (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
AS49544i3Dnet i3D.net B.VUpstream (inferred)15
AS4230AS4230 - CLARO S.A.Upstream (inferred)10
AS18106VIEWQWEST-SG-AP - Viewqwest Pte LtdUpstream (inferred)10

Downstreams (1)

ASNameRelationshipPathsLast Seen
AS200600—Downstream (inferred)Inferred—

Registry and network details

Registered holderSEZNAM-CZ Seznam.cz, a.s.
RegisteredYes
Peering policyOpen
IRR AS-setAS-SEZNAM-CZ
Registry record last modified
MaintainersRIPE-NCC-END-MNT, SEZNAM-MNT
Internet exchanges3
Facilities0
Network profile updated

Some information on this page is from an earlier update because a data source is temporarily unavailable.

Data updated . See limitations.