AS204921
Zhenyun Sun — as204921.net
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Summary
| Country |
 United Kingdom
|
| Organization | Zhenyun Sun |
| Domain | as204921.net |
| Number of IPv4 | 512 |
| Number of IPv6 | 6.5161× 1026 |
| AS Type | Hosting |
| Registry | RIPE NCC |
| Allocated | October 10, 2025 (about 8 months ago) |
| Updated | May 29, 2026 (about 27 days ago) |
IP Ranges
AS204921 announces 2 IPv4 ranges and 13 IPv6 ranges.
That's a total of 512 IPv4 addresses and 6.5161× 1026 IPv6 addresses.
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 142.249.114.0/24 |
 ZHENYUN SUN RESEARCH NETWORK
|
256 | ARIN | REASSIGNMENT |
| 142.249.115.0/24 |
 ZHENYUN SUN RESEARCH NETWORK
|
256 | ARIN | REASSIGNMENT |
| Prefix | Organization | Size | Registry | Status |
|---|---|---|---|---|
| 2a0e:aa07:e250::/44 |
Zhenyun Sun
|
1.9343× 1025 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e251::/48 |
 Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e252::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e253::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e254::/48 |
 Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e256::/48 |
 Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e257::/48 |
 Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e258::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a0e:aa07:e259::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a12:cb41:800::/39 |
Zhenyun Sun
|
6.1897× 1026 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a12:cb41:801::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a12:cb41:802::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
| 2a12:cb41:803::/48 |
Zhenyun Sun
|
1.2089× 1024 | RIPE NCC | ALLOCATED-BY-LIR |
Peers
AS204921 actively fosters the following peering relationships that enhance network performance through direct, settlement-free traffic exchange. Even with a modest number of peers, each connection serves as a strategic asset—optimizing routing, reducing latency, and minimizing transit costs.
Upstreams
AS204921 connects to the global Internet via at least 6 upstream providers. In this setup, AS204921 acts as a customer, subscribing to these transit services to obtain full BGP routing information and ensure reliable, redundant access to external networks.
Downstreams
AS204921 serves as a transit provider the following ASes, delivering the BGP routes needed for global connectivity. This downstream relationship underscores AS204921's role in extending Internet access beyond its own infrastructure.