Home Prefix Lookup221.6.0.0/16

221.6.0.0/16 - CHINA UNICOM China169 Backbone (AS4837)

IPv4APNICallocatedAS4837CHINA169-Backbone - CHINA UNICOM China169 Backbone RPKI Valid

CIDR

221.6.0.0/16

IP Version

IPv4

Addresses

65.5K

Mask

/16 (255.255.0.0)

Country

🇨🇳 China

City

Suzhou

RIR

APNIC

Status

allocated

Allocated

2003-01-09

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
221.6.0.0/16	AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone	Valid	APNICOther IRR	2026-10-12

More-Specific Announcements

3 more-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
221.6.4.0/24	AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone	Valid	-	2026-10-12
221.6.54.0/24	AS4837 CHINA169-Backbone - CHINA UNICOM China169 Backbone	Valid	-	2026-10-12
221.6.175.0/24	AS140717 UNICOM-JSSZ-IDC - UNICOM JiangSu Suzhou IDC network	Valid	-	2026-10-12

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
221.6.0.0/16	AS4837	/16	apnic

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS4837	APNIC	MAINT-CNCGROUP-RR	2008-09-04
AS9929	APNIC	MAINT-CNCGROUP-RR	2008-09-04
AS4837	Other IRR	MAINT-AS58453	2023-11-13

More Specific Prefixes

100

Prefix	AS	Country	Status
221.6.3.64/26		🇨🇳CN	assigned
221.6.5.128/26		🇨🇳CN	assigned
221.6.6.0/25		🇨🇳CN	assigned
221.6.6.128/26		🇨🇳CN	assigned
221.6.6.192/26		🇨🇳CN	assigned
221.6.7.0/26		🇨🇳CN	assigned
221.6.7.64/26		🇨🇳CN	assigned
221.6.7.128/27		🇨🇳CN	assigned
221.6.7.192/27		🇨🇳CN	assigned
221.6.16.192/26		🇨🇳CN	assigned
221.6.17.160/27		🇨🇳CN	assigned
221.6.19.0/26		🇨🇳CN	assigned
221.6.29.64/27		🇨🇳CN	assigned
221.6.44.0/25		🇨🇳CN	assigned
221.6.50.128/26		🇨🇳CN	assigned
221.6.51.64/26		🇨🇳CN	assigned
221.6.54.0/24	AS4837	🇨🇳CN	assigned
221.6.64.64/26		🇨🇳CN	assigned
221.6.65.64/26		🇨🇳CN	assigned
221.6.65.128/25		🇨🇳CN	assigned
221.6.66.192/26		🇨🇳CN	assigned
221.6.69.192/26		🇨🇳CN	assigned
221.6.71.192/26		🇨🇳CN	assigned
221.6.72.64/26		🇨🇳CN	assigned
221.6.72.128/26		🇨🇳CN	assigned
221.6.72.192/26		🇨🇳CN	assigned
221.6.73.128/25		🇨🇳CN	assigned
221.6.78.192/26		🇨🇳CN	assigned
221.6.79.128/25		🇨🇳CN	assigned
221.6.80.128/26		🇨🇳CN	assigned
221.6.85.128/26		🇨🇳CN	assigned
221.6.88.64/26		🇨🇳CN	assigned
221.6.88.192/26		🇨🇳CN	assigned
221.6.90.0/26		🇨🇳CN	assigned
221.6.96.0/24		🇨🇳CN	assigned
221.6.100.0/24		🇨🇳CN	assigned
221.6.108.128/26		🇨🇳CN	assigned
221.6.113.0/24		🇨🇳CN	assigned
221.6.114.0/24		🇨🇳CN	assigned
221.6.119.0/24		🇨🇳CN	assigned
221.6.122.0/26		🇨🇳CN	assigned
221.6.125.0/24		🇨🇳CN	assigned
221.6.150.128/26		🇨🇳CN	assigned
221.6.151.128/26		🇨🇳CN	assigned
221.6.163.0/26		🇨🇳CN	assigned
221.6.172.0/24		🇨🇳CN	assigned
221.6.178.0/24		🇨🇳CN	assigned
221.6.178.0/26		🇨🇳CN	assigned
221.6.178.64/26		🇨🇳CN	assigned
221.6.179.0/26		🇨🇳CN	assigned
221.6.191.0/25		🇨🇳CN	assigned
221.6.191.128/26		🇨🇳CN	assigned
221.6.194.0/24		🇨🇳CN	assigned
221.6.195.0/25		🇨🇳CN	assigned
221.6.195.128/25		🇨🇳CN	assigned
221.6.196.0/25		🇨🇳CN	assigned
221.6.196.128/25		🇨🇳CN	assigned
221.6.197.0/24		🇨🇳CN	assigned
221.6.198.0/25		🇨🇳CN	assigned
221.6.198.128/25		🇨🇳CN	assigned
221.6.199.0/24		🇨🇳CN	assigned
221.6.200.0/25		🇨🇳CN	assigned
221.6.200.128/25		🇨🇳CN	assigned
221.6.201.0/25		🇨🇳CN	assigned
221.6.201.128/26		🇨🇳CN	assigned
221.6.201.192/26		🇨🇳CN	assigned
221.6.202.0/24		🇨🇳CN	assigned
221.6.203.0/26		🇨🇳CN	assigned
221.6.203.64/26		🇨🇳CN	assigned
221.6.203.128/25		🇨🇳CN	assigned
221.6.204.64/26		🇨🇳CN	assigned
221.6.204.192/26		🇨🇳CN	assigned
221.6.208.0/24		🇨🇳CN	assigned
221.6.209.0/24		🇨🇳CN	assigned
221.6.210.0/26		🇨🇳CN	assigned
221.6.211.0/24		🇨🇳CN	assigned
221.6.212.0/24		🇨🇳CN	assigned
221.6.213.0/24		🇨🇳CN	assigned
221.6.214.192/27		🇨🇳CN	assigned
221.6.215.0/25		🇨🇳CN	assigned
221.6.215.128/25		🇨🇳CN	assigned
221.6.216.0/27		🇨🇳CN	assigned
221.6.216.32/27		🇨🇳CN	assigned
221.6.216.64/26		🇨🇳CN	assigned
221.6.216.128/25		🇨🇳CN	assigned
221.6.218.64/27		🇨🇳CN	assigned
221.6.221.0/26		🇨🇳CN	assigned
221.6.221.64/26		🇨🇳CN	assigned
221.6.221.128/26		🇨🇳CN	assigned
221.6.221.192/26		🇨🇳CN	assigned
221.6.226.0/23		🇨🇳CN	assigned
221.6.228.0/22		🇨🇳CN	assigned
221.6.231.192/27		🇨🇳CN	assigned
221.6.234.160/27		🇨🇳CN	assigned
221.6.239.128/26		🇨🇳CN	assigned
221.6.241.192/26		🇨🇳CN	assigned
221.6.244.128/25		🇨🇳CN	assigned
221.6.247.128/26		🇨🇳CN	assigned
221.6.251.0/24		🇨🇳CN	assigned
221.6.252.0/24		🇨🇳CN	assigned

Origin ASN

AS4837

CHINA169-Backbone - CHINA UNICOM China169 Backbone

Related Prefixes

More prefixes of AS4837

All prefixes of AS4837 →

Geolocation

Country🇨🇳ChinaCN

RegionJiangsu

CitySuzhou

Coordinates31.2983, 120.5830 ↗

Learn more

RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
RPKI validatorCheck ROA coverage for any prefix or ASN
What is BGP?How prefixes are announced and routed
More-specific prefixesGlossary: covering and more-specific routes
IPv4 transfers in the APNIC regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/221.6.0.0/16

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/221.6.0.0/16" | jq

External Links

RIPEstat