# H3C现场服务 vs About Subnet Mask

The clearest difference is ads: H3C现场服务 at none against About Subnet Mask's shown. H3C现场服务 also leads on iOS requirement (9.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

H3C现场服务 ships an update every 11 days, About Subnet Mask every 9 days. The most recent releases landed on October 9, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | H3C现场服务 | About Subnet Mask |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/about-subnet-mask/id1662782439/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 11 days | **Every 9 days** |
| Monetization | — | Ad-supported |
| Size | 83 MB | 9 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [New H3C Technologies Co., Ltd.](https://appshunter.io/developer/449593615) | [Jaehwa Noh](https://appshunter.io/developer/1629220949) |

## What reviewers say

### H3C现场服务

[App page](https://appshunter.io/ios/app/h3c/id1516459045)

**Features:** macOS Compatibility

**In-app purchases:** none


### About Subnet Mask

[App page](https://appshunter.io/ios/app/about-subnet-mask/id1662782439)

This utility tool calculates subnet masks based on IP and subnet inputs. It supports both IP and CIDR formats, determines class-based network numbers, and saves previous calculations for easy access. Users can also check the class of any IP address.

**Highlights:** Subnet mask calculation, IP and CIDR format support, Class-based network number calculation, IP class checking, Search history

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is H3C现场服务 free?

H3C现场服务 is free to download, with no in-app purchases.

### Is About Subnet Mask free?

About Subnet Mask is free to download, with no in-app purchases.

### Do H3C现场服务 or About Subnet Mask have ads?

About Subnet Mask shows ads; H3C现场服务 does not.

### Which is updated more often, H3C现场服务 or About Subnet Mask?

H3C现场服务 ships an update every 11 days, and About Subnet Mask every 9 days. Most recently, H3C现场服务 was updated on October 9, 2026 and About Subnet Mask on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*