10.0.21.242 router login
To open the admin panel, type 10.0.21.242 into your browser's address bar. If the page does not load, this is probably not the gateway address on your network — see the checks below.
10.0.21.242 router passwords
Where to find them:
- The label on the underside or back of the router — most manufacturers print the default admin username, password and Wi-Fi key there.
- The quick-start card or manual that came in the box.
- Your ISP's account portal, if the device was supplied by them — many set a unique password per line rather than a shared default.
No credential pair is documented for 10.0.21.242, and listing a plausible one would be guesswork. Identify the device that holds the address, then take its defaults from the source shipped with it: the case label, the setup card, or the manual. Where the equipment came from an internet provider, that provider's documentation is the reference.
How to log in to your router
Type 10.0.21.242 into your browser's address bar and press Enter. Type it by hand rather than accepting an autocomplete suggestion, which often fills in a different address you visited before.
If the browser reports that it cannot reach 10.0.21.242, this is not the gateway address on your network. On Windows run ipconfig /all and read the Default Gateway line; on macOS open System Settings, Network, Details, TCP/IP; on Linux run ip route and read the address after "default via".
If the login page loads but rejects your credentials, and you have never changed them, use the defaults printed on the device's label. If they have been changed and nobody knows the new password, a factory reset is the only way back in.
If you do not know the password
If the interface cannot be opened at all, the reset button restores factory state and with it the printed login. That erases the working configuration, including forwarded ports, firewall exceptions, DHCP reservations and any renamed networks, and returns the Wi-Fi SSID and passphrase to the label defaults, so each connected device has to be reconnected afterwards.
The address 10.0.21.242 comes from 10.0.0.0/8, which RFC 1918 reserved for internal use. Nothing about it identifies an organisation, a provider or a place, since the same digits are simultaneously valid in unrelated networks worldwide. What the block does imply is scale: 16,777,216 addresses behind a 255.0.0.0 mask, routinely broken into small subnets across corporate sites, campuses, managed home equipment, carrier plant and container clusters.
Locally that means 10.0.21.0/24, whose usable range is 10.0.21.1 to 10.0.21.254 and whose broadcast address is 10.0.21.255; 106 further addresses in the subnet are documented here. Ending in 242 puts the host near the top of the range, an area often given over to DHCP leases or held back for equipment added later. Anyone reading this has usually seen the address in a connected-devices list and wants to know what it is.
Whois information for 10.0.0.0/8
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2024, American Registry for Internet Numbers, Ltd.
#
NetRange: 10.0.0.0 - 10.255.255.255
CIDR: 10.0.0.0/8
NetName: PRIVATE-ADDRESS-ABLK-RFC1918-IANA-RESERVED
NetHandle: NET-10-0-0-0-1
Parent: ()
NetType: IANA Special Use
OriginAS:
Organization: Internet Assigned Numbers Authority (IANA)
RegDate: 1995-06-23
Updated: 2013-08-30
Comment: These addresses are in use by many millions of independently operated networks, which might be as small as a single computer connected to a home gateway, and are automatically configured in hundreds of millions of devices. They are only intended for use within a private context and traffic that needs to cross the Internet will need to use a different, unique address.
Comment:
Comment: These addresses can be used by anyone without any need to coordinate with IANA or an Internet registry. The traffic from these addresses does not come from ICANN or IANA. We are not the source of activity you may see on logs or in e-mail records. Please refer to http://www.iana.org/abuse/answers
Comment:
Comment: These addresses were assigned by the IETF, the organization that develops Internet protocols, in the Best Current Practice document, RFC 1918 which can be found at:
Comment: http://datatracker.ietf.org/doc/rfc1918
Ref: https://rdap.arin.net/registry/ip/10.0.0.0
OrgName: Internet Assigned Numbers Authority
OrgId: IANA
Address: 12025 Waterfront Drive
Address: Suite 300
City: Los Angeles
StateProv: CA
PostalCode: 90094
Country: US
RegDate:
Updated: 2012-08-31
Ref: https://rdap.arin.net/registry/entity/IANA
OrgAbuseHandle: IANA-IP-ARIN
OrgAbuseName: ICANN
OrgAbusePhone: +1-310-301-5820
OrgAbuseEmail: abuse@iana.org
OrgAbuseRef: https://rdap.arin.net/registry/entity/IANA-IP-ARIN
OrgTechHandle: IANA-IP-ARIN
OrgTechName: ICANN
OrgTechPhone: +1-310-301-5820
OrgTechEmail: abuse@iana.org
OrgTechRef: https://rdap.arin.net/registry/entity/IANA-IP-ARIN
Other documented addresses in 10.0.21.0/24
The 10.0.21.0/24 subnet runs from 10.0.21.1 to 10.0.21.254, with 10.0.21.255 reserved as the broadcast address. These are the addresses in it we hold router login details for.
Most looked up in this subnet
All addresses we cover here
107 addresses in this subnet have a page; the most looked-up are listed here.