These blocks are registered to Vietnam Internet Network Information Center (VNNIC) but cryptographically authorized across 18 different networks — typical for a large wholesale or transit carrier whose address space is substantially re-announced by downstream customers under their own ASNs, not individually noteworthy.

2405:4800::/30 /30	authorized for AS18403 — FPT Telecom Company
2402:dd40::/32 /32	authorized for AS45894 — FPT Online JSC
2402:4e0::/32 /32	authorized for AS38244 — VNG Corporation
2402:43a0::/32 /32	authorized for AS154003 — NOBIDEV COMPANY LIMITED
2001:df4:3740::/48 /48	authorized for AS152986 — VPSMMOCLOUD LLC
2001:df6:22c0::/48 /48	authorized for AS154247 — MCO HA NOI TECHNOLOGY COMPANY LIMITED
2001:df6:4540::/48 /48	authorized for AS154339 — Zyn Data Technology Solutions Co., Ltd.
2001:df6:46c0::/48 /48	authorized for AS142025 — VINFAST Production and Trading Joint Stock Company
2001:df6:4a40::/48 /48	authorized for AS154350 — ATZ CORP JOINT STOCK COMPANY
2001:df6:60c0::/48 /48	authorized for AS132301 — TVL Service Technology Company Limited
2001:df6:ab40::/48 /48	authorized for AS154491 — NETCORE COMPANY LIMITED
2001:df6:d440::/48 /48	authorized for AS154552 — XYLENTIS COMPANY LIMITED
2001:df6:f540::/48 /48	authorized for AS45903 — CMC Telecom Infrastructure Company
2001:df7:1040::/48 /48	authorized for AS154699 — Unica Solutions Joint Stock Company
138.252.132.0/23 /23	authorized for AS154339 — Zyn Data Technology Solutions Co., Ltd.

AS131122 AS131123 AS131415 AS153539 AS23899 AS23902 AS23962 AS24066 AS24089 AS38736 AS38737 AS45554 +76 more