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TP-Link Archer AX21 (AX1800) vs Netgear Nighthawk R7000 (AC1900)

One has no default password to find; the other still has a working one.

For comparing two routers you own or are choosing between— every field below is cited to the manufacturer's own documentation.
FieldTP-Link Archer AX21 (AX1800)Netgear Nighthawk R7000 (AC1900)
Categoryrouterrouter
Login addresshttp://tplinkwifi.nethttp://routerlogin.net
Gateway IP192.168.0.1192.168.1.1
Username— none —admin
Password— no default —password
Credential typeSet on setup (no default — you create one on first login)Static default (a real password ships out of the box)

What actually differs

The Archer AX21 (Wi-Fi 6, budget tier) has no username field and no factory password — TP-Link's official AX20/AX1800 FAQ confirms you create a login password the first time you visit tplinkwifi.net.

The R7000, still common as a hand-me-down or secondhand AC1900 router, ships with a real, working default: admin / password at routerlogin.net (192.168.1.1), per Netgear's KB 24340. If you're buying one used instead of a new AX21, that default is the first thing to check and change — not assume it's already been reset.

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.

Netgear Nighthawk R7000 (AC1900)
Factory reset

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

FAQ

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 is the default password for the Netgear Nighthawk R7000 (AC1900)?
Netgear Nighthawk R7000 (AC1900): password
What's the real difference between the TP-Link Archer AX21 (AX1800) and the Netgear Nighthawk R7000 (AC1900)?
The Archer AX21 (Wi-Fi 6, budget tier) has no username field and no factory password — TP-Link's official AX20/AX1800 FAQ confirms you create a login password the first time you visit tplinkwifi.net.