10.0.21.1 router login
To open the admin panel, type 10.0.21.1 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.
10.0.21.1 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 username and password is recorded for 10.0.21.1. The .1 position suggests infrastructure, but it does not reveal what kind, and a gateway holding this address in a structured corporate scheme was almost certainly configured with credentials chosen locally.
For hardware still in its shipped state, the defaults are printed on the unit's label or given in the installation guide for that model. Where the segment belongs to an employer, a campus or a service provider, the login is administrative and will come from whoever runs the network rather than from any published list.
How to log in to your router
Type 10.0.21.1 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 10.0.21.1, 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
Resetting a device that serves as a segment gateway takes the whole subnet offline with it. The reset clears interface addressing, routing and NAT rules, DHCP scopes, VLAN definitions, firewall policy and VPN configuration, so every host behind 10.0.21.1 loses connectivity until all of that is rebuilt.
Because no vendor is known for this address, no specific button or timing can be given. Try console or out-of-band access first, then any documented password-recovery boot mode, then a configuration backup. On a network you do not administer, raise a ticket instead of pressing anything.
10.0.21.1 sits within 10.0.0.0/8, the largest RFC 1918 range at 16,777,216 addresses behind a 255.0.0.0 mask. That block is standard in corporate and campus networks, ISP-managed CPE, carrier-grade equipment, VPN address pools and container or orchestration networks, where it is subnetted far below /8 before any host is numbered. Being private space, it belongs to no registry and no operator, and the same address runs on many networks at once.
The surrounding subnet is 10.0.21.0/24, with hosts from 10.0.21.1 to 10.0.21.254 and 10.0.21.255 reserved for broadcast. This address occupies position one, the first usable slot, which on many networks is where the router, firewall or layer-three switch interface for the segment lives. The third octet of 21 fits the common convention of mapping a VLAN or site number into the subnet, so this often reads as the gateway for VLAN 21 rather than as a random host. Our records list 106 other documented addresses in the same /24.
Most people arriving here are trying to open a gateway's management page, or have found it listed as their default route and want 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.