CESNET2

AS2852 · CZ · RIPENCC

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Upstream providers

Downstream customers

850k

v4 addresses

v6 /32s

Provider History

Active Possible trial (<90d) Historical

Current Providers

Provider	First Seen	Last Seen	Peers
AS6939 AS6939	2025-01-01 1y 3mo	2026-04-23	15 peers AS151704
Blindspot AS60606	2025-05-10 11mo	2026-04-23	221 peers AS209 AS260 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS41811 AS48112 AS49544 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
MGI AS20723	2025-11-23 5mo	2026-04-23	69 peers AS209 AS999 AS1031 AS2518 AS2914 AS3320 AS3491 AS3549 AS4128 AS4641 AS5392 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS12956 AS14630 AS14907 AS15562 AS15692 AS16276 AS16347 AS16552 AS17350 AS17660 AS20080 AS27986 AS28329 AS32590 AS34927 AS35266 AS35280 AS35710 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263009 AS263541 AS266213 AS328964 AS398465

Customers (17)

Customer	Country	First Seen	Last Seen	Peers
ROWANet-AS AS48091	CZ	2025-01-01 1y 3mo	2026-04-23	138 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS4775 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS16260 AS16276 AS16552 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS35710 AS41811 AS45352 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
SKODAPOWER-AS AS51727	CZ	2025-01-01 1y 3mo	2026-04-23	124 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS4775 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS37697 AS49544 AS49605 AS51185 AS52468 AS52873 AS53828 AS55720 AS132884 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964
SITMP AS61110	CZ	2025-01-01 1y 3mo	2026-04-23	145 peers AS209 AS260 AS5580 AS8582 AS16260 AS151704
SUKL_AS AS197277	CZ	2025-01-01 1y 3mo	2026-04-23	137 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS37697 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
VUTBR-AS AS197451	CZ	2025-01-01 1y 3mo	2026-04-23	145 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS37697 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
NCISA-AS AS199711	CZ	2025-01-01 1y 3mo	2026-04-23	189 peers AS209 AS260 AS5580 AS8582 AS16260 AS151704
LBC-AS-CZ AS200874	CZ	2025-01-01 1y 3mo	2026-04-23	137 peers AS209 AS260 AS5580 AS8582 AS16260 AS151704
PLZ-AS-CZ AS201648	CZ	2025-01-01 1y 3mo	2026-04-23	145 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS35710 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
ZL-AS-CZ AS202874	CZ	2025-01-01 1y 3mo	2026-04-23	139 peers AS209 AS260 AS999 AS1031 AS2518 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5392 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14630 AS14907 AS15562 AS15692 AS16260 AS16276 AS16347 AS16552 AS17350 AS17660 AS20080 AS27986 AS28329 AS32590 AS34927 AS35266 AS35280 AS35710 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS212317 AS216285 AS262462 AS263009 AS263541 AS266213 AS328964 AS398465
RSD-CZ AS204772	CZ	2025-01-01 1y 3mo	2026-04-23	11 peers AS209 AS260 AS5580 AS8582 AS16260
msk AS208093	CZ	2025-01-01 1y 3mo	2026-04-23	194 peers AS209 AS260 AS999 AS1031 AS2152 AS2500 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS35710 AS38001 AS41811 AS48112 AS49434 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
KZCR AS210367	CZ	2025-01-01 1y 3mo	2026-04-23	140 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS37697 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
Vysocina-hSOC AS210498	CZ	2025-01-01 1y 3mo	2026-04-23	145 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS14315 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS35710 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
CZ-PARDUBICKYKRAJ AS212876	CZ	2025-01-01 1y 3mo	2026-04-23	159 peers AS209 AS260 AS999 AS1031 AS2914 AS3257 AS3320 AS3491 AS3549 AS4128 AS4641 AS5580 AS6453 AS6730 AS6762 AS6830 AS7018 AS8220 AS8582 AS12956 AS15562 AS16260 AS16276 AS17350 AS17660 AS20080 AS27986 AS28329 AS34927 AS37697 AS41811 AS48112 AS49544 AS49605 AS51185 AS52075 AS52468 AS52873 AS53828 AS55720 AS132884 AS134823 AS151704 AS197580 AS199524 AS216285 AS262462 AS263541 AS264479 AS266213 AS328964 AS398465
NBU AS213152	CZ	2025-01-01 1y 3mo	2026-04-23	102 peers AS209 AS260 AS5580 AS8582 AS16260 AS151704
MUNINET-AS AS198500	CZ	2025-04-29 1y	2026-04-23	131 peers AS209
KU-AS AS199604	CZ	2025-10-31 6mo	2026-04-23	5 peers AS260 AS3257 AS5580 AS8582 AS16260

Network Size

IPv4 and IPv6 prefixes originated over time

v4 prefixes

850k

v4 addresses

v6 prefixes

v6 /32s

Downstream Customers Over Time

Count of distinct downstream customers per snapshot date

Unclassified Peers Over Time

Count of unclassified adjacencies per snapshot date

Event Log

All New Transit Lost Transit Possible Trial Renewal Approaching

2026-04-23

Possible Trial

CESNET2 AS2852 → possible trial with GEANT_IAS_VRF AS21320

Confidence: 60% Duration: 84d

⇄

2026-03-26

Lost Transit

CESNET2 AS2852 → dropped provider SEABONE-NET AS6762

Confidence: 85% Duration: 448d

⇄

2026-03-18

New Transit

SKODAPOWER-AS AS51727 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2026-03-14

Lost Transit

CESNET2 AS2852 → dropped provider AS6939 AS6939

Confidence: 85% Duration: 436d

⇄

2026-02-21

Lost Transit

CESNET2 AS2852 → dropped provider GEANT_IAS_VRF AS21320

Confidence: 85% Duration: 112d

⇄

2026-01-31

Lost Transit

MUNINET-AS AS198500 → dropped 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 → dropped provider Blindspot AS60606

Confidence: 85% Duration: 244d

⇄

2025-12-29

Lost Transit

CESNET2 AS2852 → dropped provider Blindspot AS60606

Confidence: 85% Duration: 232d

⇄

2025-12-17

Lost Transit

CESNET2 AS2852 → dropped provider Blindspot AS60606

Confidence: 85% Duration: 220d

⇄

2025-12-11

Lost Transit

CESNET2 AS2852 → dropped provider Blindspot AS60606

Confidence: 85% Duration: 214d

⇄

2025-11-24

Lost Transit

SKODAPOWER-AS AS51727 → dropped provider CESNET2 AS2852

Confidence: 85% Duration: 326d

⇄

2025-11-24

New Transit

CESNET2 AS2852 → added provider AS6939 AS6939

Confidence: 90%

⇄

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%

⇄

2025-07-28

Possible Trial

MUNINET-AS AS198500 → possible trial with CESNET2 AS2852

Confidence: 60%

⇄

2025-06-22

New Transit

CESNET2 AS2852 → added provider Blindspot AS60606

Confidence: 90%

⇄

2025-06-19

Lost Transit

CESNET2 AS2852 → dropped provider AS6939 AS6939

Confidence: 85% Duration: 168d

⇄

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 → dropped provider CESNET2 AS2852

Confidence: 85% Duration: 145d

⇄

2025-05-12

Lost Transit

CESNET2 AS2852 → dropped 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 → dropped provider PROZETA-NET AS49025

Confidence: 85% Duration: 124d

⇄

2025-04-30

Lost Transit

MUNINET-AS AS198500 → dropped provider CESNET2 AS2852

Confidence: 85%

⇄

2025-04-29

Possible Trial

CESNET2 AS2852 → possible trial with AS6939 AS6939

Confidence: 60% Duration: 28d

⇄

2025-04-27

Possible Trial

CESNET2 AS2852 → possible trial with AS6939 AS6939

Confidence: 60% Duration: 26d

⇄

2025-04-24

Possible Trial

CESNET2 AS2852 → possible trial with AS6939 AS6939

Confidence: 60% Duration: 23d

⇄

2025-04-23

Lost Transit

CESNET2 AS2852 → dropped provider PROZETA-NET AS49025

Confidence: 85% Duration: 111d

⇄

2025-04-21

New Transit

CESNET2 AS2852 → added provider PROZETA-NET AS49025

Confidence: 90%

⇄

2025-04-09

Possible Trial

CESNET2 AS2852 → possible trial with AS6939 AS6939

Confidence: 60% Duration: 8d

⇄

2025-04-06

Possible Trial

CESNET2 AS2852 → possible trial with PROZETA-NET AS49025

Confidence: 60% Duration: 5d

⇄

2025-04-03

Possible Trial

CESNET2 AS2852 → possible trial with PROZETA-NET AS49025

Confidence: 60% Duration: 2d

⇄

2025-04-02

New Transit

NBU AS213152 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

CZ-PARDUBICKYKRAJ AS212876 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

Vysocina-hSOC AS210498 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

KZCR AS210367 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

msk AS208093 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

RSD-CZ AS204772 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

ZL-AS-CZ AS202874 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

PLZ-AS-CZ AS201648 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

LBC-AS-CZ AS200874 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

NCISA-AS AS199711 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

VUTBR-AS AS197451 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

SUKL_AS AS197277 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

SITMP AS61110 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

SKODAPOWER-AS AS51727 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

ROWANet-AS AS48091 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-04-02

New Transit

CESNET2 AS2852 → added provider SEABONE-NET AS6762

Confidence: 90%

⇄

2025-02-13

Lost Transit

CESNET2 AS2852 → dropped provider PROZETA-NET AS49025

Confidence: 85% Duration: 42d

⇄

2025-02-02

Lost Transit

CESNET2 AS2852 → dropped provider AS6939 AS6939

Confidence: 85% Duration: 31d

⇄

2025-01-25

New Transit

RSD-CZ AS204772 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-21

Lost Transit

CESNET2 AS2852 → dropped provider PROZETA-NET AS49025

Confidence: 85% Duration: 19d

⇄

2025-01-18

New Transit

CESNET2 AS2852 → added provider AS6939 AS6939

Confidence: 90%

⇄

2025-01-10

Lost Transit

CESNET2 AS2852 → dropped provider AS6939 AS6939

Confidence: 85% Duration: 8d

⇄

2025-01-07

Lost Transit

CESNET2 AS2852 → dropped provider PROZETA-NET AS49025

Confidence: 85% Duration: 5d

⇄

2025-01-03

New Transit

CESNET2 AS2852 → added provider AS6939 AS6939

Confidence: 90%

⇄

2025-01-02

New Transit

NBU AS213152 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

CZ-PARDUBICKYKRAJ AS212876 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

Vysocina-hSOC AS210498 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

KZCR AS210367 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

msk AS208093 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

ZL-AS-CZ AS202874 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

PLZ-AS-CZ AS201648 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

LBC-AS-CZ AS200874 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

NCISA-AS AS199711 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

VUTBR-AS AS197451 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

SUKL_AS AS197277 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

SITMP AS61110 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

SKODAPOWER-AS AS51727 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

New Transit

ROWANet-AS AS48091 → added provider CESNET2 AS2852

Confidence: 90%

⇄

2025-01-02

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.