Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/securitytalent/bugskill-ai/asnreconnpx skills add SecurityTalent/bugskill-ai --skill asnrecongit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/securitytalent/bugskill-ai/asnrecon)<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/asnrecon"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/asnrecon.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00069 | $0.00991 |
| Opus 5 | $0.00034 | $0.00495 |
| Sonnet 5 | $0.00014 | $0.00198 |
| Haiku 4.5 | $0.00007 | $0.00099 |
Grade A, and why
AsnRecon scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AsnRecon
Discover a company's network footprint by finding their ASNs and owned IPv4 ranges using bgp.he.net.
Why This Matters: Companies often own IP space that isn't discoverable through DNS. Finding ASNs and IP ranges reveals infrastructure that subdomain enumeration misses - data centers, cloud deployments, legacy systems, and internal networks.
Workflow Routing
When executing a workflow, output this notification directly:
Running the **WorkflowName** workflow from the **AsnRecon** skill...
| Workflow | Trigger | File |
|---|---|---|
| FindAsn | "find ASN", "ASN lookup", "company ASN" | workflows/FindAsn.md |
| FindIpRanges | "find IP ranges", "IPv4 prefixes", "owned IP space" | workflows/FindIpRanges.md |
| FullAsnRecon | "full ASN recon", "network footprint", "all IP ranges" | workflows/FullAsnRecon.md |
Examples
Example 1: Full ASN reconnaissance (RECOMMENDED)
User: "Find the IP ranges owned by Acme Corp"
→ Invokes FullAsnRecon workflow
→ Searches bgp.he.net for "Acme Corp"
→ Identifies all ASNs associated with the company
→ Extracts IPv4 prefixes from each ASN's Prefixes V4 tab
→ Outputs {company}-asn-report.md with all ranges
→ User has complete network footprint for testing
Example 2: Find company's ASN numbers
User: "What ASNs does Netflix own?"
→ Invokes FindAsn workflow
→ Searches bgp.he.net free-form for "Netflix"
→ Lists all ASN numbers with organization names
→ Outputs ASN list for further investigation
Example 3: Get IPv4 prefixes for known ASN
User: "Show me the IPv4 ranges for AS2906"
→ Invokes FindIpRanges workflow
→ Fetches bgp.he.net/AS2906#_prefixes4
→ Extracts all IPv4 CIDR ranges
→ Outputs list of IP ranges for scanning
Data Source
bgp.he.net - Hurricane Electric's BGP Toolkit
- Free to use, no authentication required
- Free-form search by company name, ASN, IP, or prefix
- Comprehensive BGP routing data
- Shows origin ASNs, prefixes, and relationships
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 120 lines · 69 tokens per session scan A e619dd3897b2
AsnRecon is a skill published in the GitHub repository SecurityTalent/bugskill-ai (6 stars, last pushed 20d ago), licensed MIT. It adds 69 tokens to every session and 991 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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