@Lorimer Yes what you have found is true, yet this can be done due to different reasons
inet6num: 2a0c:b641:b20::/44
netname: CN-TANZHANG-20231117
country: CN
admin-c: PN5569-RIPE
tech-c: PN5569-RIPE
status: ALLOCATED-BY-LIR
org: ORG-TZ18-RIPE
mnt-by: SERVPERSO-MNT
mnt-by: PindarNOC-MNT
created: 2023-11-19T14:36:07Z
last-modified: 2023-11-19T14:36:07Z
source: RIPE
organisation: ORG-TZ18-RIPE
org-name: Tan Zhang
country: CN
org-type: OTHER
address: Yin xiang li, Wen Hua Xin Da Jie Room 209,Building D Beijing 100028, Beijing CN
abuse-c: AM51239-RIPE
mnt-ref: PindarNOC-MNT
mnt-by: PindarNOC-MNT
mnt-ref: SERVPERSO-MNT
mnt-by: SERVPERSO-MNT
created: 2023-11-19T14:35:04Z
last-modified: 2023-11-19T14:35:04Z
source: RIPE # Filtered
role: Pindar NOC
address: 4M, Dynasty Plaza, No. 411-417, Alameda Dr. Carlos d?Assumpcao, Macao
nic-hdl: PN5569-RIPE
abuse-mailbox: abuse@pindar.io
mnt-by: PindarNOC-MNT
created: 2023-11-17T10:01:37Z
last-modified: 2023-11-17T10:15:19Z
source: RIPE # Filtered
route6: 2a0c:b641:b20::/44
origin: AS215969
mnt-by: SERVPERSO-MNT
mnt-by: PindarNOC-MNT
created: 2023-11-20T17:07:13Z
last-modified: 2023-11-20T17:07:21Z
source: RIPE
The ASN data shows Pindar as the maintainer, registered under a Chinese organization (Tan Zhang). As shown in the NP self declaration address it is in fact maintained by Pindar
As per Pindar’s network presence, they appear to manage nodes in South Korea and Hong Kong. Therefore, it is logical and cost-effective to use BGP transit from these locations rather than purchasing new IP blocks. (Logical assumption)
Link to Servperso Systems and Tunnel Peering
According to BGP.tools, the parent of this IPv6 prefix (2a0c:b641:b21::/48 ) is Servperso Systems, based in Belgium. This explains why older databases may indicate Belgium as the origin location. You can see this here:
https://bgp.tools/prefix/2a0c:b641:b21::/48#asinfo
Servperso Systems provides tunnel peering services, which enables them to allocate and deliver IP subnets to clients like Pindar across different regions.
Evidence Supporting Seoul as the Location:
As seen here AS215969 Tan Zhang - bgp.tools
AS20473 (Vultr) is an Upstream Provider:
Vultr has a well-documented presence in Seoul, South Korea.
Since AS215969 (Tan Zhang/Pindar NOC) peers with AS20473 for connectivity, the node could logically be using Vultr’s Seoul PoP for routing.
I know that there is no clean quick way to check IP validity via IP tools as BGP is more complex routing. We can inquire NP and upstream provider to verify this infomation.