# Octet Network Toolkit — Subnet Calc, Ping, DNS & SSL

> Subnet Calc, Ping, DNS & SSL (iPhone/iPad app by mika koike.)

- Source: https://appshunter.io/ios/app/octet-network-toolkit/id6782346294 (this page in markdown: same URL + `.md`)
- Developer: [mika koike](https://appshunter.io/developer/6782346446)
- Category: Utilities, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English, Japanese
- Released: 2026-06-29
- Data updated: 2026-10-25

## What is Octet Network Toolkit?

Octet Network Toolkit is an all-in-one network diagnostics toolkit for network engineers, infrastructure teams and learners. From subnet math to live diagnostics, everything you need in the field is in one app.

■ Calculators (on-device, free)
・IPv4 subnet calculator: CIDR / subnet mask / broadcast / host range / binary view / subnet splitting
・IPv6 calculator: compressed and expanded forms / address count / EUI-64 generation
・Tap any result to copy it

■ Diagnostic tools
・DNS lookup (A/AAAA/MX/TXT and more), reverse lookup (PTR), whois
・SSL certificate check (chain, expiry, cipher suite), HTTP headers
・Public IP lookup
・ping (reachability and RTT), traceroute (path tracing)
・TCP port scan, LAN device scan (Bonjour), Wake-on-LAN
・MAC vendor lookup (offline OUI database)

■ Privacy first
・No account required
・No ads, no tracking
・Subnet calculations run entirely on your device
(Diagnostic tools, by their nature, communicate with the targets you specify and servers along the network path.)

■ Octet Pro
Unlock all diagnostic tools, unlimited history, iCloud history sync across devices, and SSL certificate expiry reminders. Choose a monthly subscription or a one-time purchase (Universal Purchase: buy once, use on iPhone, iPad and Mac).

Available in English and Japanese — choose your language on first launch or anytime in Settings.

The diagnostic features are intended for use on systems you are authorized to test and for legitimate purposes. Please comply with the target system's terms of use, your organization's policies and applicable laws.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Octet Pro 月額 | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Octet Pro 買い切り | $6.99 | one-time |


## Is Octet Network Toolkit safe?

Not enough ratings yet to assess Octet Network Toolkit.

## Is Octet Network Toolkit legit?

Octet Network Toolkit has limited verification signals. The AppsHunter Legitimacy Score for Octet Network Toolkit is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-10-05

Octet now speaks English! Choose English or Japanese on first launch, or switch anytime in Settings.

### 1.0 — 2026-06-29

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*