10.0.21.20 router login
To open the admin panel, type 10.0.21.20 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.
10.0.21.20 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 default credential pair is known for this address, so none is listed. Identify the device before hunting for a login: the factory account and password are commonly printed on the equipment's own label, repeated in its manual, and for ISP-provisioned or company-managed units, supplied through the provider's documentation or an internal asset record.
How to log in to your router
Type 10.0.21.20 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 10.0.21.20, 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
When access is lost entirely, a hardware factory reset is the standard remedy — typically a recessed button held for ten to thirty seconds until the lights cycle. Be clear about the consequences: every customised setting, from routing and DHCP reservations to security policy, is erased, and the Wi-Fi name and password fall back to the values on the label, disconnecting all existing clients.
Addresses starting with 10 belong to 10.0.0.0/8, and 10.0.21.20 sits inside it. RFC 1918 marks this range as private, gives it the netmask 255.0.0.0 and provides 16,777,216 addresses — the largest of the private allocations, and the one favoured by corporate and campus networks, ISP-managed CPE, carrier equipment, VPN pools and container fabrics that subnet it far below /8 before use.
The local network is 10.0.21.0/24, where valid hosts run from 10.0.21.1 to 10.0.21.254 and 10.0.21.255 is the broadcast address. A final octet of 20 is low, though not among the first addresses a router is conventionally assigned; positions like this are frequently set aside as static addresses for servers, printers, cameras or access points. Anyone searching for it is generally trying to match the address to a physical device seen in a scan or log. Another 106 addresses in this /24 are documented separately.
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.