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Subnet Calculator (IPv4 + IPv6) · automateyournetwork | DecimalAI

devopsby automateyournetwork

Subnet Calculator (IPv4 + IPv6)

automateyournetwork/subnet-calculator

Source automateyournetwork/netclaw ↗License Apache-2.0

IPv4 and IPv6 subnet calculator - CIDR breakdown, usable hosts, previous/next subnets, address classification, VLSM planning, and dual-stack analysis.

NewMaintained

Automatic

DevOps & SRE pack

Last verified 8/16/2026

What it changes

Passed 7 of 13 test cases with the skill, and 8 of 13 without it.

Without skill65%

With skill52%

Checks it passed that the model alone missed

The response specifies subnet_calculator_v6
The response specifies subnet_calculator_auto
The response identifies pyats_configure_device

and 5 more in the full report

7 fixed5 passed either way1 still failing10 broke

Pass-rate lift: -13 pp
Tokens: +178%
Agent turns: 0%
Response time: -3%

Model gemini-3.6-flashMeasured 8/16/2026v112 of 23 cases passed with skill · 13 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/automateyournetwork-subnet-calculator/SKILL.md https://app.decimal.ai/s/automateyournetwork-subnet-calculator/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add automateyournetwork-subnet-calculator, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/automateyournetwork-subnet-calculator/ and pins it in .decimal/skills.lock

decimalai skills add automateyournetwork-subnet-calculator

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/automateyournetwork-subnet-calculator/SKILL.md https://app.decimal.ai/s/automateyournetwork-subnet-calculator/SKILL.md

Raw file: /s/automateyournetwork-subnet-calculator/SKILL.md ↗ · machine-readable summary at /s/automateyournetwork-subnet-calculator.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 7

Prompt

When passing '2001:db8:abcd::/48' into the subnet calculator suite without pre-checking its IP version, what JSON tool payload should be submitted to the auto-detect tool?

What was checked, without and with the skill
Checked	Without skill	With skill
The tool name specified is subnet_calculator_auto	Missed	Passed
The parameter payload contains cidr set to 2001:db8:abcd::/48	Missed	Passed

case-09 · gemini-3.6-flash · 8/16/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md213 linessingle file

Subnet Calculator (IPv4 + IPv6)

Available Tools

1. `subnet_calculator` — IPv4 Subnet Details

python3 $MCP_CALL "python3 -u $SUBNET_MCP_SCRIPT" subnet_calculator '{"cidr":"192.168.1.0/24"}'

Parameters:

cidr (required): IPv4 CIDR notation, e.g., 10.0.0.0/8, 172.16.0.0/12, 192.168.1.0/24

Returns:

Network address, broadcast address, netmask, wildcard mask
Prefix length, host bits
Number of total and usable addresses
First and last usable host addresses
Usable hosts preview (up to 10)
Previous and next subnets (same size)
Address classification: private, global, link-local, multicast, loopback, reserved
Human-readable summary

2. `subnet_calculator_v6` — IPv6 Subnet Details

python3 $MCP_CALL "python3 -u $SUBNET_MCP_SCRIPT" subnet_calculator_v6 '{"cidr":"2001:db8::/48"}'

Parameters:

cidr (required): IPv6 CIDR notation, e.g., 2001:db8::/32, fd00::/64, fe80::/10

Returns:

Network address (compressed and exploded forms)
Last address in range
Prefix length, host bits
Number of addresses (exact for /64+, exponential notation for larger)
Number of /64 subnets contained
Previous and next subnets
Address classification: ULA, global unicast, link-local, multicast

Track record

Benchmark

7 / 13

test cases passed, vs 8 / 13 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

automateyournetwork / netclaw

workspace/skills/subnet-calculator/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/3/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Subnet Calculator (IPv4 + IPv6)

Available Tools

1. subnet_calculator — IPv4 Subnet Details

2. subnet_calculator_v6 — IPv6 Subnet Details

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills

1. `subnet_calculator` — IPv4 Subnet Details

2. `subnet_calculator_v6` — IPv6 Subnet Details