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IEEE 802.11a
IEEE 802.11b
IEEE 802.11g
WiFi 4 (802.11n)
WiFi 5 (802.11ac)
IPv4
IPv6

Guest Network

"The Guest Network provides Internet connection for guests but restricts access to your local network."
Support Guest Network

"The Guest Network provides Internet connection for guests but restricts access to your local network."
• Maximum Guest Network Rule : 2.4GHz x3, 5GHz x3
Guest Network Connection Time Limit
Guest Network Encryption : Open system, WPA/WPA2-Personal

Transmit / Receive

2.4GHz 2x2
5GHz 2x2

2.4GHz 3x3
5GHz 3x3

Security

AiProtection
VPN
WPA/WPA2/WPA3-Personal, WPA/WPA2-Enterprise
WPS
Let's Encrypt
DNS-over-TLS
Security Scan
Firewall

AiProtection
Open system, WPA/WPA2-Personal, WPA/WPA2-Enterprise
WPS
Let's Encrypt
SSH
Firewall
• Maximum Firewall Keyword Filter : 64
• Maximum Firewall Network Service Filter : 32
• Maximum Firewall URL Filter : 64

VPN

Instant Guard
VPN Client L2TP
VPN Client Open VPN
VPN Client PPTP
VPN Client WireGuard
VPN Server IPSec
VPN Server Open VPN
VPN Server PPTP
VPN Server WireGuard
VPN Fusion

VPN Client L2TP
VPN Client Open VPN
VPN Client PPTP
VPN Server Open VPN
VPN Server PPTP

Antenna

Internal antennas x 4

External antenna x 3

Traffic Control

Adaptive QoS
• Bandwidth Monitor
• Bandwidth Limiter
Traditional QoS
Traffic Monitor
Traffic Analyzer
• Website History

Adaptive QoS
• Bandwidth Monitor
• Bandwidth Limiter
-- Maximum Bandwidth Limiter Rule : 32
Traditional QoS
-- Maximum Traditional QoS Rule : 32
Traffic Monitor
• Real-time Traffic Monitor
• Wired Traffic Monitor
• Wireless Traffic Monitor
Traffic Analyzer
• Traffic Analysis Period : Daily, Weekly, Monthly
• Website History

LED Indicator

Power x 1

Power x 1
Wi-Fi x 2
LAN x 4
WAN x 1
USB x 2

Operating Frequency

2.4 GHz
5 GHz

2.4G Hz / 5 GHz

Buttons

WPS button, Reset button, Power switch

WPS Button,
Reset Button,
Power Button,
Wireless on/off Button

Product Dimensions

140 x 70 x 140 mm

220 x 160 x 83 ~ mm (WxDxH)

LAN

DHCP Server
IGMP Snooping
IPTV
Manually Assign IP Address
Wake on LAN (WOL)

DHCP Server
IGMP Snooping
IPTV
Manually Assign IP Address
• Maximum Manually Assign IP Address Rule : 64
Wake on LAN (WOL)

Parental Control

"Allow you to block access to unwanted websites and apps."
Web & Apps Filters
Time Scheduling
Reward
Parental Control - Safe Browsing
Customized Internet Schedule

"Allow you to block access to unwanted websites and apps."
Customized Internet Schedule
• Maximum Parental Control Profile : 16
• Maximum Parental Control Content Filter Rule : 16

Administration

Diagnosis Tools
Feedback System
System Log
New Device Connect Notification
Login Captcha
Connection Diagnosis
Auto Firmware Update

Configuration Backup and Restore
Diagnosis tools
Feedback System
System Log

Memory

RAM 512MB , Flash 128MB

128 MB Flash, 256 MB RAM

Operating Mode

Wireless Router Mode
AiMesh Node Mode
Access Point Mode

Accesspoint, AiMeshnode, Mediabridge, Repeater, Router

WiFi Data Rate

WiFi 7 (802.11be) (2.4GHz): up to 688 Mbps
WiFi 7 (802.11be) (5GHz): up to 2882 Mbps

802.11a : up to 54 Mbps
802.11b : up to 11 Mbps
802.11g : up to 54 Mbps
WiFi 4 (802.11n) : up to 450 Mbps
WiFi 4 (802.11n) TurboQAM : up to 600 Mbps
WiFi 5 (802.11ac) : up to 1300 Mbps

Smart Home

Support Google Assistant

WAN

Port Forwarding
Port Triggering
DMZ
DDNS

Internet connection Type : PPPoE, PPTP, L2TP, Automatic IP, Static IP
Dual WAN
3G / 4G LTE dongle
Port forwarding
• Maximum Port Forwarding Rule : 64
Port triggering
• Maximum Port Triggering Rule : 32
DMZ
DDNS
NAT Passthrough : PPTP, L2TP, IPSec, RTSP, H.323, SIP Passthrough,PPPoE relay

Model Name

BD4(W-2-PK)
BD4(W-1-PK)
BD4(B-1-PK)
BD4(B-3-PK)
BD4(W-3-PK)
BD4(B-2-PK)

USB application

File System : HFS+, NTFS, vFAT, ext2, ext3, ext4
HDD Hibernation
Safely Remove Disk
AiCloud
Download Master
AiDisk
Media Server
Time Machine
Samba Server
FTP Server
Shared Folder Privileges

I/O Ports

2.5G x 2 (WAN/LAN auto detecting)

RJ45 for 10/100/1000/Gigabits BaseT for LAN x 4, RJ45 for 10/100/1000/Gigabits BaseT for WAN x 1
USB 2.0 x 1
USB 3.0 x 1

AiMesh

AiMesh
• Primary AiMesh Router
• AiMesh Node

Power Supply

AC Input : 110V~240V(50~60Hz)
DC Output : 12V with max 1.5A current

AC Input : 110V~240V(50~60Hz)
DC Output : 19 V with max. 1.75 A current

Package Content

ZenWiFi BD4
RJ45 cable
Power adapter
Warranty card
Quick start guide

1 x RT-AC68U Wireless-AC1900 Dual Band Gigabit Router
1 x RJ-45 cable
1 x Power adapter
1 x QSG
1 x Support CD(user manual and ultility)

Product Weight (g)

835 g

AiProtection

AiProtection Pro
• Router Security Assessment
• Malicious Site Blocking
• Two-Way IPS
• Infected Device Prevention and Blocking

• Router Security Assessment
• Malicious Site Blocking
• Two-Way IPS
• Infected Device Prevention and Blocking

Processor

1.5GHz quad-core processor

Product Segment

AC1900 ultimate AC performance : 600+1300 Mbps

Remark

Content may vary in different regions and packages.

Router APP

APP: ASUS Router APP

Boosts Speed

OFDMA (Orthogonal Frequency Division Multiple Access)
Beamforming: standard-based and universal
4096-QAM high data rate
20/40/80/160 MHz bandwidth

Wireless

MU-MIMO
UTF-8 SSID
WiFi MAC Address Filter
Wireless Scheduler
Airtime Fairness
RADIUS Client
Universal Beamforming
Explicit Beamforming

UTF-8 SSID
WiFi MAC Address Filter
• Maximum MAC Filters : 64
Wireless Scheduler
Airtime Fairness
RADIUS Client
Universal Beamforming
Explicit Beamforming

- The actual transfer speed of USB 3.0, 3.1, 3.2, and/or Type-C will vary depending on many factors including the processing speed of the host device, file attributes and other factors related to system configuration and your operating environment.
- Actual data throughput and WiFi coverage will vary from network conditions and environmental factors, including the volume of network traffic, building material and construction, and network overhead, result in lower actual data throughput and wireless coverage.
- Quoted network speeds and bandwidth based on current IEEE 802.11ac specifications. Actual performance may be affected by network and service provider factors, interface type, and other conditions. Connected devices must be 802.11ac-compatible for best results.
- WPA/WPA2 enterprise is only available on single router, is not available under AiMesh mode.
- When traditional QoS is enabled, there will be limitations due to the actual Internet service bandwidth and different environment, and there may be a risk of speed reduction.
- Due to the different power supply requirements on USB external hard disk and 4G/5G Modem device, to ensure that the external device can be used stably, if the USB external device exceeds the standard USB 2.0 (5V/500mA) and USB 3.1 Gen 1 (5V/900mA) power supply requirements, you need to use it with an independent external power supply.
- If you use the product in conjunction with a third party service, you are responsible for complying with the third party provider's terms and conditions and privacy policy and are also at the risk of such use. ASUS does not provide support or guarantee continuous integration support for products that are not part of ASUS.
- The device is restricted to indoor use only when operating in the 5150-5350 MHz frequency band in certain regions, including the EU, Asia-Pacific countries, Australia, and Canada. Outdoor use in this band may be prohibited or require regulatory approval. Check local regulations before deployment.
- For models with Time machine support, starting with macOS 26 (Tahoe), Time Machine no longer supports creating new backups on USB-connected storage devices. Existing Time Machine drives that were previously configured remain compatible and can continue to be used for backup and restoration.
- The actual transfer speed of USB 3.0, 3.1, 3.2, and/or Type-C will vary depending on many factors including the processing speed of the host device, file attributes and other factors related to system configuration and your operating environment.
- Actual data throughput and WiFi coverage will vary from network conditions and environmental factors, including the volume of network traffic, building material and construction, and network overhead, result in lower actual data throughput and wireless coverage.
- Quoted network speeds and bandwidth based on current IEEE 802.11ac/802.11ax specifications. Actual performance may be affected by network and service provider factors, interface type, and other conditions. Connected devices must be 802.11ac/802.11ax compatible for best results.
- WPA/WPA2 enterprise is only available on single router, is not available under AiMesh mode.
- When traditional QoS is enabled, there will be limitations due to the actual Internet service bandwidth and different environment, and there may be a risk of speed reduction.
- Due to the different power supply requirements on USB external hard disk and 4G/5G Modem device, to ensure that the external device can be used stably, if the USB external device exceeds the standard USB 2.0 (5V/500mA) and USB 3.1 Gen 1 (5V/900mA) power supply requirements, you need to use it with an independent external power supply.
- If you use the product in conjunction with a third party service, you are responsible for complying with the third party provider's terms and conditions and privacy policy and are also at the risk of such use. ASUS does not provide support or guarantee continuous integration support for products that are not part of ASUS.
- For models with Time machine support, starting with macOS 26 (Tahoe), Time Machine no longer supports creating new backups on USB-connected storage devices. Existing Time Machine drives that were previously configured remain compatible and can continue to be used for backup and restoration.