(AS21856) — BGP Market Intelligence

AS21856 · US · ARIN

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2

Upstream providers

0

Downstream customers

1.3k

v4 addresses

<0.1

v6 /32s

Provider History

Active Possible trial (<90d) Historical

Current Providers

Addr family: All IPv4 IPv6

Provider	First Seen	Last Seen	Peers	Confidence	AF
CHINA169-Backbone AS4837	2024-09-01 1y 8mo	2026-05-14	62 peers AS3130 AS3320 AS3491 AS4128 AS6082 AS14537 AS19151 AS23673 AS24516 AS35710 AS37697 AS38008 AS46997 AS55720 AS64475 AS197580 AS199524 AS328964		v4 v6
CT-HangZhou-IDC AS58461	2024-09-01 1y 8mo	2026-05-14	31 peers AS209 AS3549		v4 v6

Customers (0)

Addr family: All IPv4 IPv6

No customers in current snapshot.

Network Size

IPv4 and IPv6 prefixes originated over time

5

v4 prefixes

1.3k

v4 addresses

1

v6 prefixes

<0.1

v6 /32s

Peering Links Over Time

Count of unclassified adjacencies per snapshot date

Event Log

All New Transit Lost Transit Possible Trial Renewal Approaching

2026-02-04

New Transit

AS21856 AS21856 → added provider CT-HangZhou-IDC AS58461

Confidence: 90%

⇄

2025-11-20

Lost Transit

AS21856 AS21856 → lost provider CT-HangZhou-IDC AS58461

Confidence: 85% Duration: 444d

⇄

2024-09-02

New Transit

AS21856 AS21856 → added provider CT-HangZhou-IDC AS58461

Confidence: 90%

⇄

2024-09-02

New Transit

AS21856 AS21856 → added provider CHINA169-Backbone AS4837

Confidence: 90%

⇄

Renewal Calendar

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

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