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Netgear Nighthawk R6700 / R6400 (AC1750) vs TP-Link Archer AX21 (AX1800)

Upgrading from the R6700 to the AX21 means losing a known default password, not gaining a new one.

For comparing two routers you own or are choosing between— every field below is cited to the manufacturer's own documentation.
FieldNetgear Nighthawk R6700 / R6400 (AC1750)TP-Link Archer AX21 (AX1800)
Categoryrouterrouter
Login addresshttp://routerlogin.nethttp://tplinkwifi.net
Gateway IP192.168.1.1192.168.0.1
Usernameadmin— none —
Passwordpassword— no default —
Credential typeStatic default (a real password ships out of the box)Set on setup (no default — you create one on first login)

What actually differs

The R6700 (AC1750) ships a real, documented default — admin / password at routerlogin.net (192.168.1.1), per Netgear's KB 1148, unchanged unless someone already reset it.

The AX21 (Wi-Fi 6, AX1800) that commonly replaces it has no default at all: TP-Link's official AX20/AX1800 FAQ confirms you create the login password yourself at tplinkwifi.net (192.168.0.1), with no username field. If your household has "admin / password" memorized for the old router, that habit doesn't carry over to the new one — there's nothing to type until you set it.

Netgear Nighthawk R6700 / R6400 (AC1750)
Factory reset

Go to http://www.routerlogin.net (192.168.1.1) with admin / password. To reset, hold the Restore Factory Settings button with a paperclip ~7 seconds until the Power LED blinks amber.

TP-Link Archer AX21 (AX1800)
Factory reset

Visit http://tplinkwifi.net and create a login password on first setup. To reset, hold Reset until the LEDs turn on, then create a new password.

FAQ

What is the default password for the Netgear Nighthawk R6700 / R6400 (AC1750)?
Netgear Nighthawk R6700 / R6400 (AC1750): password
What is the default password for the TP-Link Archer AX21 (AX1800)?
TP-Link Archer AX21 (AX1800): — no default — — Created the first time the router is set up.
What's the real difference between the Netgear Nighthawk R6700 / R6400 (AC1750) and the TP-Link Archer AX21 (AX1800)?
The R6700 (AC1750) ships a real, documented default — admin / password at routerlogin.net (192.168.1.1), per Netgear's KB 1148, unchanged unless someone already reset it.