AS43037 Seznam.cz, a.s.

Czechia SEZNAM-CZ RIPE 6 IPv4 prefixes 6 IPv6 prefixes

IPv4 addresses

3,072

IPv6 /48 networks

65,536

RPKI

12 valid0 no ROA

Peers and downstreams

114

Holder

AS name: SEZNAM-CZ
Description: Seznam.cz, a.s.
Organisation: Seznam.cz, a.s.
Abuse contact: abuse@seznam.cz
Assigned: 2007-05-28
Registered: 2007-05-29
Record last changed: 2017-11-15 09:48 UTC

185.66.188.0/22 77.75.72.0/23 77.75.74.0/24 77.75.75.0/24 77.75.76.0/23 77.75.78.0/23

AS553	Belwue BELWUE
AS559	SWITCH Switch
AS1764	Next Layer Telekommunikationsdienstleistungs- und Beratungs GmbH NEXTLAYER-AS
AS1828	Unitas Global UNITAS
AS1836	green.ch AG GREEN
AS3212	Telemach Slovenija d.o.o. TELEMACH
AS3214	xTom GmbH XTOM
AS4230	CLARO S.A. AS4230
AS4455	IX Reach Ltd BSO
AS5405	Inter.link GmbH INTERDOTLINK
AS6057	Administracion Nacional de Telecomunicaciones AS6057
AS6204	TMRC GROUP SRL ZET-NET
AS6424	EDGOO NETWORKS UNIPESSOAL LDA EDGOO
AS6663	Euroweb Romania S.R.L. TTI-NET
AS6695	DE-CIX Management GmbH DECIX-AS
AS6797	GlobalConnect AB GLOBALCONNECT-NET
AS6881	NIX.CZ z.s.p.o. NIXCZ
AS7195	EDGEUNO S.A.S AS7195
AS7713	PT Telekomunikasi Indonesia telkomnet-as-ap
AS8218	Zayo Infrastructure France SA NEO-ASN
AS8298	IPng Networks GmbH IPNG
AS8529	Zain Omantel International FZ-LLC OMANTEL-AS
AS8758	Iway AG IWAY
AS8888	xTom Pty Ltd XTOM
AS12577	MMC GmbH MMC-AT-AS
AS12779	IT.Gate S.p.A. ITGATE
AS12859	BIT BV NL-BIT
AS13237	euNetworks GmbH LAMBDANET-AS
AS14630	Invesco Group Services, Inc. INVESCO
AS14840	BR.Digital Telecom AS14840
AS15547	netplus.ch SA NETPLUS
AS17557	Pakistan Telecommunication Company Limited PKTELECOM-AS-PK
AS17639	Converge ICT Solutions Inc. CONVERGE-AS
AS18106	Viewqwest Pte Ltd VIEWQWEST-SG-AP
AS20326	TeraSwitch Networks Inc. TERASWITCH
AS20485	Joint Stock Company TransTeleCom TRANSTELECOM
AS20562	Broadband Hosting B.V. OPEN-PEERING-AS
AS20764	CJSC RASCOM RASCOM-AS
AS20932	Services Industriels de Geneve SIG-ST
AS21412	UAB "Cgates" CGATES-AS
AS22356	Durand do Brasil Ltda AS22356
AS24482	SG.GS SGGS-AS-AP
AS24889	Monzoon Networks AG MONZOON-AS
AS24961	WIIT AG MYLOC-AS
AS25091	IP-Max SA IP-Max
AS25160	Vorboss Limited VORBOSS
AS25220	equada network GmbH GLOBALNOC-AS
AS28716	Retelit Digital Services S.p.A. RETELIT-AS
AS28917	Fiord Networks, UAB Fiord-AS
AS29075	IELO-LIAZO SERVICES SAS IELO
AS29140	Hostserver GmbH HOSTSERVER-AS
AS29504	Freenet Liberec, z.s. LBCFREE
AS29632	Netassist International EOOD NASSIST-AS
AS29691	Nine Internet Solutions AG NINE
AS29838	Atlantic Metro Communications II, Inc. AMC
AS31510	Innsbrucker Kommunalbetriebe AG IKB-AS
AS33891	Core-Backbone GmbH CORE-BACKBONE
AS34019	Hivane Association HIVANE
AS34177	Celeste SAS CELESTE-AS
AS34288	Kantonsschule Zug AS34288
AS34549	meerfarbig GmbH & Co. KG MEER-AS
AS34927	iFog GmbH iFog-GmbH
AS35280	F5 Networks SARL F5
AS35360	Gargunet GARGUNET
AS35598	INETCOM CARRIER LLC INETCOM
AS35625	Eurofiber France SAS EUROFIBER-FRANCE
AS35710	weber.digital GmbH WEBERCLOUD
AS36236	NetActuate, Inc NETACTUATE
AS37100	SEACOM Limited
AS37468	Angola Cables
AS37721	Virtual Technologies & Solutions
AS39249	Netassist International EOOD KICUA-AS
AS39351	31173 Services AB ESAB-AS
AS40994	Hohl IT e.U. Alwyzon
AS41327	Fiber Telecom S.p.A. FIBERTELECOM-AS
AS42541	Fiberby ApS FIBERBY
AS44901	Belcloud LTD belcloud
AS45489	Sri Lanka Telecom PLC, GLobal Peering SLT-GLOBAL
AS47147	Anexia Cloud Solutions GmbH AS-ANX
AS47232	ISP Alliance a.s. ISPAlliance
AS47692	Nessus GmbH NESSUS
AS48362	Tkswf TKSWF-AS
AS48919	UACITY Ltd. UA-CITY-AS
AS49544	i3D.net B.V i3Dnet
AS51184	Fonira Telekom GmbH FONIRA
AS51185	MainStreaming SpA MAINSTREAMING-AS
AS56662	Eutpnet EUTPNET
AS56987	ABACLOUDA SAS AS-ABACLOUDA
AS57777	Jeroen Massar MASSAR
AS58057	Securebit AG SECUREBIT
AS58299	Openfactory GmbH OPENFACTORY-AS
AS60171	AFR-IX TELECOM S.A. AFRIX-AS
AS61573	IP TELECOM AS61573
AS64475	Freifunk Frankfurt am Main e.V. FREIFUNK-FRANKFURT
AS137409	GSL Networks Pty LTD GSLNETWORKS-AS-AP
AS142271	EWS DS Networks Inc DOUBLESQUARE-AS-AP
AS198150	SIACOM JSC SIACOM-AS
AS198249	Ops One AG OPSONE
AS198385	AlpineDC SA AlpineDC
AS199524	G-Core Labs S.A. GCORE
AS199938	Netzwerge GmbH NETZWERGE
AS200600	Seznam.cz datova centra, s.r.o. SEZNAM-CZ-DC
AS205103	Telegraph42 Management GmbH TELEGRAPH-AS
AS205112	PHILUNET GmbH PHILUNET
AS206356	Freifunk Essen e.V. Freifunk-Essen
AS209823	Enki Multimedia EURL ENKI-AS
AS210937	Showfom
AS212024	Risson RISSON
AS212483	LEVEL EIGHTY-SIX COMMUNICATIONS LTD level86
AS213151	Christian Elsen CHRISELSEN
AS213241	TECHIT.BE SRL TECHIT
AS264409	Huge Solucoes Corporativas Ltda AS264409
AS264479	Turbozone Internet AS264479

Upstream graph

Upstreams and their upstreams, from BGP paths

Network health

Grade B · 85/100

pass	Prefixes covered by valid ROAs 12 of 12 announced prefixes are RPKI valid.	25/25
pass	No RPKI invalid announcements None of the announcements is RPKI invalid.	10/10
pass	Announces IPv6 6 IPv6 prefixes.	15/15
pass	More than one upstream 3 upstreams seen in BGP.	10/10
pass	Working abuse contact abuse@seznam.cz is published.	15/15
fail	Publishes a geofeed No geofeed found. Without one, location databases have to guess.	0/10
pass	No prefixes smaller than /24 or /48 All prefixes are /24 (IPv4) or /48 (IPv6) or larger.	10/10
fail	Registry record maintained Last changed 2017-11-15.	0/5

Built from the announced prefixes, RPKI, the registry record and geofeeds. Checks without data are not counted. Also in the API.

Show this on your website

HTML

<a href="https://ip-fd.net/asn/43037"><img src="https://ip-fd.net/badge/asn/43037/health.svg" alt="AS43037 network health on IP-FD.net"></a>

Markdown

[![AS43037 network health](https://ip-fd.net/badge/asn/43037/health.svg)](https://ip-fd.net/asn/43037)

Use rpki.svg instead of health.svg for the RPKI badge.

Routing changes

Last 30 days

2026-10-04 11:58 UTC	Neighbour gone	AS52320	peer
2026-10-04 11:58 UTC	Neighbour gone	AS31027	peer
2026-10-04 11:58 UTC	Neighbour gone	AS4601	upstream
2026-10-04 11:58 UTC	New neighbour	AS8888	peer
2026-10-04 11:58 UTC	Relationship changed	AS8218	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS264479	peer
2026-10-04 11:58 UTC	Relationship changed	AS8758	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS7713	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS7195	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS6797	peer
2026-10-04 11:58 UTC	Relationship changed	AS6695	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS6663	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS6204	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS6057	peer
2026-10-04 11:58 UTC	Relationship changed	AS60171	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS5405	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS48362	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS47232	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS47147	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS4455	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS4230	peer
2026-10-04 11:58 UTC	Relationship changed	AS41327	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS39351	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS39249	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS37468	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS37100	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS35625	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS35280	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS34927	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS34549	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS34177	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS34019	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS33891	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS29838	peer
2026-10-04 11:58 UTC	Relationship changed	AS29691	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS29632	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS28716	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS264409	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS25091	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS24961	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS24889	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS22356	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS212024	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS20764	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS20562	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS205103	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS20485	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS20326	peer
2026-10-04 11:58 UTC	Relationship changed	AS1836	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS1764	upstream to peer
2026-10-04 11:58 UTC	New neighbour	AS17557	peer
2026-10-04 11:58 UTC	Relationship changed	AS14840	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS137409	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS12859	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS12779	upstream to peer
2026-10-04 11:58 UTC	Relationship changed	AS12577	upstream to peer

WHOIS

aut-num:        AS43037
as-name:        SEZNAM-CZ
org:            ORG-Sa508-RIPE
admin-c:        SZN5-RIPE
tech-c:         SZN5-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         SEZNAM-MNT
created:        2007-05-29T08:00:03Z
last-modified:  2017-11-15T09:48:45Z
source:         RIPE
% 5 routing policy lines (import/export) not shown

Routing data

Updated just now

Registry record

Fetched just now from RIPE

Prefixes and neighbours come from the RIPE RIS route collectors. Data older than 5 minutes is refreshed when this page is opened.

API

curl -H "X-API-Key: YOUR_KEY" https://ip-fd.net/api/v1/asn/43037

const res = await fetch('https://ip-fd.net/api/v1/asn/43037', {
  headers: { 'X-API-Key': 'YOUR_KEY' }
});
const data = await res.json();
console.log(data);

import requests

r = requests.get('https://ip-fd.net/api/v1/asn/43037', headers={'X-API-Key': 'YOUR_KEY'}, timeout=10)
r.raise_for_status()
print(r.json())

<?php
$ch = curl_init('https://ip-fd.net/api/v1/asn/43037');
curl_setopt($ch, CURLOPT_HTTPHEADER, ['X-API-Key: YOUR_KEY']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = json_decode(curl_exec($ch), true);
print_r($data);

req, _ := http.NewRequest("GET", "https://ip-fd.net/api/v1/asn/43037", nil)
req.Header.Set("X-API-Key", "YOUR_KEY")
res, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Works without a key at a lower rate. Get a free key.

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