Home Prefix Lookup203.133.0.0/19

203.133.0.0/19 - BGP Prefix

IPv4APNICallocated RPKI Valid

CIDR

203.133.0.0/19

IP Version

IPv4

Addresses

8.1K

Mask

/19 (255.255.224.0)

Country

🇹🇼 Taiwan

City

Yingge District

RIR

APNIC

Status

allocated

Allocated

1998-10-26

Announced BGP Routes

0 of 0 routes

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
This prefix is not announced as a whole. Parts of it are announced as more-specific prefixes, see below.

Related Announcements

2 less-specific, 3 more-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
203.133.0.0/17	AS9416 KBT KBT Co., LTD 4F., No.57, Dongxing Rd., Xinyi Dist., Taipei City 110, Taiwan R.O.C.	Valid	-	2026-10-11
203.133.0.0/18	AS9416 KBT KBT Co., LTD 4F., No.57, Dongxing Rd., Xinyi Dist., Taipei City 110, Taiwan R.O.C.	Valid	-	2026-10-11
203.133.9.0/24	AS9416 KBT KBT Co., LTD 4F., No.57, Dongxing Rd., Xinyi Dist., Taipei City 110, Taiwan R.O.C.	Valid	-	2026-10-11
203.133.18.0/24	AS9416 KBT KBT Co., LTD 4F., No.57, Dongxing Rd., Xinyi Dist., Taipei City 110, Taiwan R.O.C.	Valid	-	2026-10-11
203.133.25.0/24	AS9416 KBT KBT Co., LTD 4F., No.57, Dongxing Rd., Xinyi Dist., Taipei City 110, Taiwan R.O.C.	Valid	-	2026-10-11

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
203.133.0.0/18	AS9416	/24	apnic
203.133.0.0/17	AS9416	/17	apnic
203.133.0.0/17	AS18042	/24	apnic

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS9416	Other IRR	MAINT-HGC-INTL	2026-10-02

More Specific Prefixes

Prefix	Country	Status
203.133.4.16/29	🇹🇼TW	assigned
203.133.5.0/28	🇹🇼TW	assigned
203.133.5.16/28	🇹🇼TW	assigned
203.133.5.32/28	🇹🇼TW	assigned
203.133.5.80/28	🇹🇼TW	assigned
203.133.5.144/28	🇹🇼TW	assigned
203.133.5.176/28	🇹🇼TW	assigned
203.133.5.224/28	🇹🇼TW	assigned
203.133.6.0/26	🇹🇼TW	assigned
203.133.6.64/26	🇹🇼TW	assigned
203.133.6.128/28	🇹🇼TW	assigned
203.133.6.192/27	🇹🇼TW	assigned
203.133.7.0/28	🇹🇼TW	assigned
203.133.7.48/28	🇹🇼TW	assigned
203.133.7.224/29	🇹🇼TW	assigned
203.133.7.232/29	🇹🇼TW	assigned
203.133.7.240/29	🇹🇼TW	assigned
203.133.7.248/29	🇹🇼TW	assigned
203.133.9.0/28	🇹🇼TW	assigned
203.133.9.32/28	🇹🇼TW	assigned
203.133.9.80/28	🇹🇼TW	assigned
203.133.9.96/27	🇹🇼TW	assigned
203.133.10.64/26	🇹🇼TW	assigned
203.133.11.0/27	🇹🇼TW	assigned
203.133.11.32/27	🇹🇼TW	assigned
203.133.11.64/27	🇹🇼TW	assigned
203.133.11.96/27	🇹🇼TW	assigned
203.133.11.160/27	🇹🇼TW	assigned
203.133.11.192/27	🇹🇼TW	assigned

Transfer History

Registry transfers of 203.133.0.0/19, blocks inside it, or blocks containing it.

203.133.0.0/19Transfer · 2026-06-18
Taiwan Network Information Center/HOSHIN
🇹🇼 TW APNIC
→
Taiwan Network Information Center/kbt-net
🇹🇼 TW APNIC

Date	Resource	From	To	Type
2026-06-18	203.133.0.0/19	Taiwan Network Information Center/HOSHIN 🇹🇼 TW APNIC	Taiwan Network Information Center/kbt-net 🇹🇼 TW APNIC	Transfer

Related Prefixes

Covering prefix

203.133.0.0/18AS9416

Geolocation

Country🇹🇼TaiwanTW

RegionTaipei

CityYingge District

Coordinates24.9622, 121.3310 ↗

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/203.133.0.0/19

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

curl -s "https://api.ipctl.io/v1/prefix/203.133.0.0/19" | jq

External Links

RIPEstat