A curated ASN blocklist project for filtering networks that should never appear in your downstream routing path.
一个用于过滤永远不应该出现在你下游的 ASN 列表
NeverBecomeYourDownstream collects multiple categories of ASNs that are generally considered undesirable as downstreams.
NeverBecomeYourDownstream 收集了多个类别的 ASN，这些网络通常不应该出现在你的下游路由中。
| Category | Description | Data Source |
|---|---|---|
| T1 | Tier1 carriers (fixed 25 ASNs) | data/t1asn.txt |
| GOV | Government organization ASNs | tags-gov.csv |
| LARGE | Large-scale networks (Hosts > 10K + Internet Critical Infrastructure) | tags-a10k.csv + tags-icrit.csv |
| COMPANY | Large enterprise/company ASNs | tags-corp.csv |
| DSL | DSL operator ASNs | tags-dsl.csv |
| ALL | Combined deduplicated list of all categories | All sources merged |
Each category (including ALL) is exported in multiple formats.
每个分类（包括 ALL 总表）都会导出为多种格式。
| Directory | Description |
|---|---|
output/bird/ |
BIRD router configuration format (.conf) |
output/txt_name/ |
Plain text with ASN names (.txt) |
output/txt_plain/ |
Plain text with ASN numbers only (.txt) |
output/csv_name/ |
CSV format with ASN names (.csv) |
output/csv_plain/ |
CSV format with ASN numbers only (.csv) |
Each output directory contains:
每个输出目录中包含：
| File | Description |
|---|---|
all |
Combined deduplicated ASN list |
t1 |
Tier1 ASN list |
gov |
Government ASN list |
large |
Large-scale network ASN list |
company |
Large company ASN list |
dsl |
DSL operator ASN list |
Example:
output/
├── bird/
│ ├── all.conf
│ ├── t1.conf
│ ├── gov.conf
│ ├── large.conf
│ ├── company.conf
│ └── dsl.conf
├── txt_plain/
├── txt_name/
├── csv_plain/
└── csv_name/
ASN metadata is primarily derived from the following sources:
ASN 元数据主要来源于以下数据源：
-
Original source / 原始来源：
- bgp.tools
-
Mirror database / 镜像数据库：
To avoid placing unnecessary load on the bgp.tools service, this project uses the mirrored BGP.Tools-OpenDB dataset instead of directly querying the original website.
为了避免对bgp.tools造成额外压力，本项目使用镜像数据库 BGP.Tools-OpenDB作为数据来源，而非直接请求原始网站