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Asus RT-AC51U+ router review

300 + 433 Mbps
IEEE 802.11a/b/g/n/ac
MediaTek MT7620A @ 580 MHz
64 MB / 16 MB

Asus introduced the RT-AC51U+ router in 2017. It is powered by MediaTek MT7620A @ 580 MHz chipset, 64 MB of RAM, and 16 MB of flash memory.

Want to know if this Asus router stands out? Stay tuned!

Table of Contents

  • Asus RT-AC51U+ specifications
    • Body, dimensions, weight
    • System, chipset, RAM, flash, power supply
    • Network, protocols, WAN and LAN ports
    • Wireless, antennas, speed, security
    • Connectivity
    • Administration, user interface, login information
  • Verdict, Pros and Cons
  • Photos
  • Comparisons

Our personal experiences and opinions form the basis of this article. We aimed to share insights on a topic, and we hoped others would find it useful and inspirational. The specs below rely on official manufacturer data, but we also consider user reviews. If you noticed any mistakes or missing details about the Asus RT-AC51U+, please let us know. Furthermore, we strive to deliver a thorough and precise overview.

Asus RT-AC51U+ / RT-AC51UP

The RT-AC51U+ is a versatile router that offers more than basic functionality. It has advanced features and capabilities. It provides a reliable, fast network for homes and offices. This router has USB connectors. They add features and expand your network's capabilities. Asus is another well-known manufacturer in the networking industry.

Asus RT-AC51U+ specifications

BrandAsus
NameRT-AC51U+
TypeRT-AC51UP
Rating
Rated 3/5 based on 1487 user votes.
Launch2017

Body

Dimensions189 x 129 x 36 mm
Weight270 g

If you plan to move or travel a lot and need to take your router with you, the size is important. It needs to be small to be easy to carry. If you purchase a router online or have it shipped, the weight may affect the overall cost.

System

ChipsetMediaTek MT7620A @ 580 MHz
RAM64 MB
Flash16 MB
OSAsus
Power supply12 V / 1 A

The MediaTek MT7620A @ 580 MHz CPU provides processing power. It handles tasks and services within the RT-AC51U+ router. Some router features and software need a certain amount of RAM. They need it to work well. More storage space comes from a larger flash memory. It can accommodate future firmware upgrades. The firmware upgrade process may vary depending on the router model. However, it often involves accessing the router's web-based administration interface. The Asus packages the RT-AC51U+ router with 12 V / 1 A PSU.

Asus RT-AC51U+ (RT-AC51UP) / 1

Network

ProtocolsIPv4
IPv6
LAN ports4 x 10/100/1000 Mbps
WAN ports1 x 10/100/1000 Mbps
Mobile networkyes, with USB dongle
VPN supportPPTP
L2TP
OpenVPN

The RT-AC51U+ router has built-in security features. They protect your network and devices. The IPv4 uses 32-bit addresses, represented as four sets of numbers separated by periods (e.g. 192.168.0.1). The router also supports IPv6. This allows you to use the latest Internet Protocol. If you have a 1 Gbps or faster internet plan, you need gigabit Ethernet ports. They are essential to use all the available bandwidth.

This router ensures that you can use fast internet from your ISP fully. You can connect the 3G/4G USB dongle to the USB port on the RT-AC51U+ router. OpenVPN uses a certificate-based authentication system. This enhances security and provides a stronger method of identity verification. PPTP uses the Password Authentication Protocol (PAP). It also uses the Challenge Handshake Authentication Protocol (CHAP) for user authentication.

Wireless

Antennas2 x 5 dBi
RP-SMA
2.4 GHzyes
5 GHzyes
60 GHzno
StandardsIEEE 802.11a/b/g/n/ac
ClassAC750
Speed300 + 433 Mbps
Transmit power18.5 dBm
SecurityWEP
WPA
WPA2
WPS
Guest networkyes

A well-positioned antenna can reduce interference and signal weakening. This leads to a more reliable connection. The RT-AC51U+ is compatible with 2.4 GHz Wi-Fi networks. Using the 5 GHz band can move some devices from the crowded 2.4 GHz band. This cuts congestion and boosts the network. The AC Wi-Fi router is backward compatible with older Wi-Fi devices that support 802.11a/b/g/n standards. Real-world RT-AC51U+ router speeds are lower than its theoretical maximum speed.

WEP was the first Wi-Fi security protocol. But it is now seen as weak and easy to hack. The introduction of WPA2 (Wi-Fi Protected Access 2) improved upon WEP. It provides stronger security. WPS (Wi-Fi Protected Setup) provides an easy method. It connects devices to a Wi-Fi network.

Asus RT-AC51U+ (RT-AC51UP) / 2

Connectivity

USB ports1 x USB 2.0
Print serveryes
File serveryes

The USB 2 port has a maximum theoretical data transfer rate of 480 megabits per second (Mbps). By connecting a USB printer to the RT-AC51U+ router, you can make it accessible to all devices on your network. This router has a USB file server. It lets you connect external storage devices to your network. For example, you can connect USB flash drives or hard drives.

Administration

Default IP192.168.1.1
Default usernameadmin
Default passwordadmin

If you can't log in to your Asus router's setup panel, try resetting it. A reset can help you troubleshoot. It is highly recommended to change the default password of your RT-AC51U+ router. Do this after the initial setup.

Pros and Cons

Every router, including this Asus one, has its good sides and not-so-good sides. Let's take a closer look at both to get a full understanding of what this router can do. We'll talk about what it does well and also where it could use some improvements. Just remember, this is just what I think, and you might see things differently.

Pros

  • lightweight
  • sufficient memory
  • IPv6 capable
  • high-speed LAN port
  • high-speed WAN port
  • 3/4G USB modem capable
  • supports OpenVPN
  • works on 5 GHz band
  • WPS friendly
  • USB 2 compatible
  • printserver functionality
  • fileserver operation

Cons

  • insufficient flash
  • missing Wi-Fi 6 support
  • incompatible with WPA3

Asus RT-AC51U+ photos

Asus RT-AC51U+ / RT-AC51UP photo
Asus RT-AC51U+ / RT-AC51UP photo
Asus RT-AC51U+ / RT-AC51UP photo
Asus RT-AC51U+ / RT-AC51UP

Asus RT-AC51U+ comparisons

We've noticed that many of our visitors like to compare the Asus RT-AC51U+ router with these popular models.

Asus ROG Rapture GT-AXE11000 (GT-AXE11000) Asus ROG Rapture GT-AXE11000 Asus RT-AC55UHP (RT-AC55UHP) Asus RT-AC55UHP Asus RT-N10E (RT-N10E) Asus RT-N10E Asus RT-N10U (RT-N10U) Asus RT-N10U

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Robert Miller
For over 15 years, I've immersed myself in the world of networking devices as a tech aficionado. I've dedicated myself to thoroughly testing and analyzing routers and other networking gear. I aim to provide thorough reviews. They will give you the knowledge needed to improve your network.
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