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CESNET2

AS2852 · CZ · RIPENCC
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3
Upstream providers
17
Downstream customers
850k
v4 addresses
8
v6 /32s

Provider History

Active Possible trial (<90d) Historical

Current Providers

Addr family: All IPv4 IPv6
Provider First Seen Last Seen Peers Confidence AF
Blindspot
AS60606
 2025-05-10
1y 1mo
 2026-06-09
221 peers
AS209 AS260 AS999 AS1031 AS2152 AS2500 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS4775 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS28624 AS31554 AS32590 AS34927 AS37697 AS38001 AS41811 AS45352 AS49434 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS58717 AS61832 AS132884 AS134823 AS140627 AS142289 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263152 AS263541 AS264409 AS264479 AS266213 AS328964
v4 v6
MGI
AS20723
 2025-11-23
6mo
 2026-06-09
79 peers
AS209 AS260 AS999 AS1000 AS1031 AS2914 AS3130 AS3257 AS3320 AS3491 AS3549 AS3741 AS4128 AS4641 AS4775 AS5392 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS6908 AS7018 AS7594 AS8220 AS8582 AS9268 AS12956 AS14537 AS14630 AS14907 AS15562 AS15692 AS16276 AS17350 AS17660 AS19151 AS19653 AS20080 AS24516 AS28329 AS28624 AS31554 AS32590 AS34927 AS35280 AS37497 AS38008 AS41811 AS46450 AS46997 AS49544 AS49605 AS51185 AS52468 AS52873 AS56457 AS57187 AS61568 AS63956 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263152 AS263541 AS264409 AS266213 AS271253 AS327983 AS328840
v4 v6
AS6939
AS6939
 2024-09-01
1y 9mo
 2026-06-09
15 peers
AS151704
v4 v6

Customers (17)

Addr family: All IPv4 IPv6
Customer Country First Seen Last Seen IPs Peers Confidence AF
ROWANet-AS
AS48091
 CZ 2024-09-01
1y 9mo
 2026-06-09 1.3k
140 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS28624 AS31554 AS34927 AS41811 AS45352 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263152 AS263541 AS264409 AS264479 AS266213
v4 v6
SITMP
AS61110
 CZ 2024-09-01
1y 9mo
 2026-06-09 512
149 peers
AS209 AS260 AS5580 AS8582 AS151704
v4 v6
SUKL_AS
AS197277
 CZ 2024-09-01
1y 9mo
 2026-06-09 4.1k
137 peers
AS209 AS260 AS5580 AS8582 AS151704
v4 v6
VUTBR-AS
AS197451
 CZ 2024-09-01
1y 9mo
 2026-06-09 57k
148 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS31554 AS34927 AS41811 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264409 AS266213
v4 v6
NCISA-AS
AS199711
 CZ 2024-09-01
1y 9mo
 2026-06-09 768
192 peers
AS209 AS260 AS5580 AS8582 AS151704
v4 v6
LBC-AS-CZ
AS200874
 CZ 2024-09-01
1y 9mo
 2026-06-09 1k
138 peers
AS209 AS260 AS5580 AS8582 AS151704
v4 v6
PLZ-AS-CZ
AS201648
 CZ 2024-09-01
1y 9mo
 2026-06-09 2k
148 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS28624 AS31554 AS34927 AS41811 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263152 AS263541 AS264409 AS264479 AS266213 AS328964
v4 v6
ZL-AS-CZ
AS202874
 CZ 2024-09-01
1y 9mo
 2026-06-09 1k
139 peers
AS209 AS260 AS999 AS1000 AS1031 AS2914 AS3130 AS3257 AS3320 AS3491 AS3549 AS3741 AS4128 AS4641 AS4775 AS5392 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS6908 AS7018 AS7594 AS8220 AS8582 AS9268 AS12956 AS14537 AS14630 AS14907 AS15562 AS15692 AS16276 AS17350 AS17660 AS19151 AS19653 AS20080 AS24516 AS28329 AS28624 AS31554 AS32590 AS34927 AS35280 AS37497 AS38008 AS41811 AS46450 AS46997 AS49544 AS49605 AS51185 AS52468 AS52873 AS56457 AS57187 AS61568 AS63956 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263152 AS263541 AS264409 AS266213 AS271253 AS327983 AS328840
v4 v6
RSD-CZ
AS204772
 CZ 2024-09-01
1y 9mo
 2026-06-09 1k
11 peers
AS209 AS260 AS5580 AS8582
v4 v6
msk
AS208093
 CZ 2024-09-01
1y 9mo
 2026-06-09 2k
200 peers
AS209 AS260 AS999 AS1031 AS2152 AS2500 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS28624 AS31554 AS32590 AS34927 AS38001 AS41811 AS49434 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS58717 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263152 AS263541 AS264409 AS264479 AS266213 AS328964
v4 v6
KZCR
AS210367
 CZ 2024-09-01
1y 9mo
 2026-06-09 512
140 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS31554 AS34927 AS41811 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264409 AS266213
v4 v6
Vysocina-hSOC
AS210498
 CZ 2024-09-01
1y 9mo
 2026-06-09 256
148 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS28624 AS31554 AS34927 AS41811 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263152 AS263541 AS264409 AS264479 AS266213
v4 v6
CZ-PARDUBICKYKRAJ
AS212876
 CZ 2024-09-01
1y 9mo
 2026-06-09 1k
159 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16276 AS17350 AS17660 AS20080 AS28329 AS31554 AS34927 AS41811 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS134823 AS142289 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264409 AS266213
v4 v6
NBU
AS213152
 CZ 2024-09-01
1y 9mo
 2026-06-09 1k
103 peers
AS260 AS3257 AS5580 AS8582
v4 v6
SKODAPOWER-AS
AS51727
 CZ 2024-10-21
1y 7mo
 2026-06-09 512
124 peers
AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS4775 AS5580 AS6082 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS16276 AS17350 AS17660 AS20080 AS28329 AS31554 AS34927 AS37697 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS56457 AS132884 AS197580 AS199524 AS216285 AS262462 AS263541 AS264409 AS264479 AS266213 AS328964
v4 v6
MUNINET-AS
AS198500
 CZ 2025-04-29
1y 1mo
 2026-06-09 4.1k
131 peers
AS209
v4 v6
KU-AS
AS199604
 CZ 2025-10-31
7mo
 2026-06-09 256
5 peers
AS260 AS3257 AS5580 AS8582
v4 v6

Network Size

IPv4 and IPv6 prefixes originated over time

27
v4 prefixes
850k
v4 addresses
1
v6 prefixes
8
v6 /32s

Downstream Customers Over Time

Count of distinct downstream customers per snapshot date

Peering Links Over Time

Count of unclassified adjacencies per snapshot date

Event Log

All New Transit Lost Transit Possible Trial Renewal Approaching
2026-03-26
Lost Transit
CESNET2 AS2852 → lost provider SEABONE-NET AS6762
Confidence: 85% Duration: 570d
⇄
2026-03-18
New Transit
SKODAPOWER-AS AS51727 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2026-03-14
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 558d
⇄
2026-02-21
Lost Transit
CESNET2 AS2852 → lost provider GEANT_IAS_VRF AS21320
Confidence: 85% Duration: 112d
⇄
2026-01-31
Lost Transit
MUNINET-AS AS198500 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 276d
⇄
2026-01-15
New Transit
KU-AS AS199604 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2026-01-10
Lost Transit
CESNET2 AS2852 → lost provider Blindspot AS60606
Confidence: 85% Duration: 244d
⇄
2025-12-29
Lost Transit
CESNET2 AS2852 → lost provider Blindspot AS60606
Confidence: 85% Duration: 232d
⇄
2025-12-17
Lost Transit
CESNET2 AS2852 → lost provider Blindspot AS60606
Confidence: 85% Duration: 220d
⇄
2025-12-11
Lost Transit
CESNET2 AS2852 → lost provider Blindspot AS60606
Confidence: 85% Duration: 214d
⇄
2025-11-24
Lost Transit
SKODAPOWER-AS AS51727 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 398d
⇄
2025-11-24
New Transit
CESNET2 AS2852 → added provider GEANT_IAS_VRF AS21320
Confidence: 90%
⇄
2025-11-24
New Transit
CESNET2 AS2852 → added provider MGI AS20723
Confidence: 90%
⇄
2025-11-24
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2025-06-22
New Transit
CESNET2 AS2852 → added provider Blindspot AS60606
Confidence: 90%
⇄
2025-06-19
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 290d
⇄
2025-06-19
Possible Trial
CESNET2 AS2852 → possible trial with Blindspot AS60606
Confidence: 60%
⇄
2025-06-08
Possible Trial
MUNINET-AS AS198500 → possible trial with CESNET2 AS2852
Confidence: 60%
⇄
2025-06-05
New Transit
RSD-CZ AS204772 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2025-05-28
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2025-05-27
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 267d
⇄
2025-05-12
Lost Transit
CESNET2 AS2852 → lost provider Blindspot AS60606
Confidence: 85% Duration: 1d
⇄
2025-05-11
New Transit
CESNET2 AS2852 → added provider Blindspot AS60606
Confidence: 90%
⇄
2025-05-06
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 246d
⇄
2025-04-30
Lost Transit
MUNINET-AS AS198500 → lost provider CESNET2 AS2852
Confidence: 85%
⇄
2025-04-23
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 233d
⇄
2025-04-21
New Transit
CESNET2 AS2852 → added provider PROZETA-NET AS49025
Confidence: 90%
⇄
2025-03-12
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 191d
⇄
2025-02-21
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 172d
⇄
2025-02-13
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 164d
⇄
2025-02-02
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 153d
⇄
2025-01-25
New Transit
RSD-CZ AS204772 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2025-01-21
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 141d
⇄
2025-01-18
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2025-01-10
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 130d
⇄
2025-01-07
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 127d
⇄
2024-12-29
Lost Transit
CESNET2 AS2852 → lost provider PROZETA-NET AS49025
Confidence: 85% Duration: 118d
⇄
2024-12-20
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 109d
⇄
2024-12-17
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 106d
⇄
2024-12-15
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 104d
⇄
2024-12-08
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 97d
⇄
2024-12-05
New Transit
RSD-CZ AS204772 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-11-25
Possible Trial
RIPE-MEETING-AS AS2121 → possible trial with CESNET2 AS2852
Confidence: 60%
⇄
2024-11-23
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 82d
⇄
2024-11-18
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2024-11-13
New Transit
SKODAPOWER-AS AS51727 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-11-02
Lost Transit
RIPE-MEETING-AS AS2121 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 16d
⇄
2024-11-01
Possible Trial
CESNET2 AS2852 → possible trial with AS6939 AS6939
Confidence: 60% Duration: 21d
⇄
2024-10-30
Lost Transit
SKODAPOWER-AS AS51727 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 8d
⇄
2024-10-26
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 54d
⇄
2024-10-25
New Transit
RSD-CZ AS204772 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-10-22
Lost Transit
SKODAPOWER-AS AS51727 → lost provider CESNET2 AS2852
Confidence: 85%
⇄
2024-10-17
New Transit
RIPE-MEETING-AS AS2121 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-10-16
Possible Trial
RSD-CZ AS204772 → possible trial with CESNET2 AS2852
Confidence: 60% Duration: 5d
⇄
2024-10-03
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 31d
⇄
2024-09-22
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2024-09-18
Lost Transit
RSD-CZ AS204772 → lost provider CESNET2 AS2852
Confidence: 85% Duration: 16d
⇄
2024-09-14
Lost Transit
CESNET2 AS2852 → lost provider AS6939 AS6939
Confidence: 85% Duration: 12d
⇄
2024-09-10
New Transit
CESNET2 AS2852 → added provider AS6939 AS6939
Confidence: 90%
⇄
2024-09-07
New Transit
RSD-CZ AS204772 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
NBU AS213152 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
CZ-PARDUBICKYKRAJ AS212876 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
Vysocina-hSOC AS210498 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
KZCR AS210367 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
msk AS208093 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
ZL-AS-CZ AS202874 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
PLZ-AS-CZ AS201648 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
LBC-AS-CZ AS200874 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
NCISA-AS AS199711 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
VUTBR-AS AS197451 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
SUKL_AS AS197277 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
SITMP AS61110 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
ROWANet-AS AS48091 → added provider CESNET2 AS2852
Confidence: 90%
⇄
2024-09-02
New Transit
CESNET2 AS2852 → added provider SEABONE-NET AS6762
Confidence: 90%
⇄

Renewal Calendar

Active providers first seen 11–13 months ago — possible annual contract renewals

This data is available to subscribers.

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