How do I install the Ipcheck skill?

Run npx skillmds@latest add liuyike200811-maker/ipcheck in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Ipcheck safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: executes scripts. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Ipcheck?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Ipcheck free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Ipcheck?

liuyike200811-maker (@liuyike200811-maker) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Ipcheck by liuyike200811-maker — Agent Skill

Name: Ipcheck
Rating: 4.2 (5 reviews)
Author: liuyike200811-maker

Ipcheck

Check one public IPv4 address with passive identity, reputation, abuse, and proxy-risk sources. Use when a user asks about an IPv4 address's ownership, cleanliness, fraud risk, proxy status, or reputation; do not use for speed tests, routing, streaming-unlock tests, port scans, local-network diagnosis, or active probing.

File contents

IPCheck

Use When

A user provides one public IPv4 address and wants a compact identity, risk, abuse, and quality assessment.
The user needs evidence from several independent passive data sources rather than a single proxy label.

Don't Use When

The task is a latency, bandwidth, route, port, streaming, or local-network test.
The target is private, CGNAT, loopback, link-local, multicast, reserved, or documentation address space.
The user asks to scan, exploit, or actively probe an address.

Workflow

Extract exactly one IPv4 address. If none or more than one is present, ask the user to identify the target.
Run the bundled script with the address as a separate argument:
```
python "<skill-dir>/scripts/ipcheck.py" "<IPv4>"
```
Preserve the script's four-row Markdown result and its conclusion. Use --json only when the user requests source-level evidence or a discrepancy must be diagnosed.
State when required sources are unavailable. Missing, rate-limited, unauthenticated, or failed sources are unknown, never clean.

Rules

Use passive, read-only lookups only. Never run an exit-IP detection script that measures the executing machine instead of the user-supplied target.
Treat one provider's VPN, proxy, or fraud label as a signal, not a definitive verdict.
Do not equate data-center hosting with abuse. Keep network type and reputation separate.
Read API credentials only from the optional environment variables in references/sources.md. Never ask users to paste secrets into chat, commands, reports, or repository files.
Do not automate human-only web checkers or bypass captchas.

Examples

python "<skill-dir>/scripts/ipcheck.py" "8.8.8.8"
python "<skill-dir>/scripts/ipcheck.py" "8.8.8.8" --json

Edge Cases

If validation rejects the address, report that it is not a routable public IPv4 and stop.
If commercial sources are unavailable, report the reduced confidence rather than filling gaps with guesses.
Spamhaus PBL is a mail-sending policy, not general maliciousness; it must not reduce the ordinary IP-quality score.

References

Source and fallback policy
Scoring policy
scripts/test_ipcheck.py provides offline fixtures for the checker.

---name: ipcheckdescription: Check one public IPv4 address with passive identity, reputation, abuse, and proxy-risk sources. Use when a user asks about an IPv4 address's ownership, cleanliness, fraud risk, proxy status, or reputation; do not use for speed tests, routing, streaming-unlock tests, port scans, local-network diagnosis, or active probing.---# IPCheck## Use When- A user provides one public IPv4 address and wants a compact identity, risk, abuse, and quality assessment.- The user needs evidence from several independent passive data sources rather than a single proxy label.## Don't Use When- The task is a latency, bandwidth, route, port, streaming, or local-network test.- The target is private, CGNAT, loopback, link-local, multicast, reserved, or documentation address space.- The user asks to scan, exploit, or actively probe an address.## Workflow1. Extract exactly one IPv4 address. If none or more than one is present, ask the user to identify the target.2. Run the bundled script with the address as a separate argument: ```powershell python "<skill-dir>/scripts/ipcheck.py" "<IPv4>" ```3. Preserve the script's four-row Markdown result and its conclusion. Use `--json` only when the user requests source-level evidence or a discrepancy must be diagnosed.4. State when required sources are unavailable. Missing, rate-limited, unauthenticated, or failed sources are unknown, never clean.## Rules- Use passive, read-only lookups only. Never run an exit-IP detection script that measures the executing machine instead of the user-supplied target.- Treat one provider's VPN, proxy, or fraud label as a signal, not a definitive verdict.- Do not equate data-center hosting with abuse. Keep network type and reputation separate.- Read API credentials only from the optional environment variables in [references/sources.md](references/sources.md). Never ask users to paste secrets into chat, commands, reports, or repository files.- Do not automate human-only web checkers or bypass captchas.## Examples```powershellpython "<skill-dir>/scripts/ipcheck.py" "8.8.8.8"python "<skill-dir>/scripts/ipcheck.py" "8.8.8.8" --json```## Edge Cases- If validation rejects the address, report that it is not a routable public IPv4 and stop.- If commercial sources are unavailable, report the reduced confidence rather than filling gaps with guesses.- Spamhaus PBL is a mail-sending policy, not general maliciousness; it must not reduce the ordinary IP-quality score.## References- [Source and fallback policy](references/sources.md)- [Scoring policy](references/scoring.md)- `scripts/test_ipcheck.py` provides offline fixtures for the checker.

Frequently asked questions