10.21.1.5 router login
To open the admin panel, type 10.21.1.5 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.
10.21.1.5 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.
There is no documented username and password for 10.21.1.5, and inventing one would be misleading. Because this position is not the customary gateway slot, the device answering may have no web login whatsoever, or may authenticate against a directory rather than a local account.
Identify the hardware first, then look for its own defaults: a printed label on the case or underside, the setup card in the box, or the manual for that model. Equipment installed by an IT department or service provider frequently has the factory account disabled and per-device credentials recorded elsewhere.
How to log in to your router
Type 10.21.1.5 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 10.21.1.5, 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
Before resetting anything at this address, confirm what it is. A static host in an infrastructure range often loses more than settings when defaulted: it usually reverts to DHCP, so it will stop answering on 10.21.1.5, and anything referring to it by address, such as print queues, monitoring checks, camera recorders or firewall rules, breaks until the assignment is rebuilt.
Where a reset is genuinely needed, the procedure is device-specific; a pinhole button held while powered is common, but the required duration and behaviour vary. Recover the configuration from a backup afterwards if one exists.
This address is a host inside 10.21.1.0/24, a slice of the 10.0.0.0/8 private range. That block, masked 255.0.0.0, spans 16,777,216 addresses and is the workhorse of larger environments: enterprise and campus LANs, ISP-managed CPE, carrier equipment, VPN pools and container networking, invariably carved into much smaller subnets before use.
What distinguishes 10.21.1.5 is where it sits. The fifth usable address in a range running 10.21.1.1 to 10.21.1.254 (broadcast 10.21.1.255) is not the conventional router position; low single-digit host numbers just above the gateway are more often set aside for infrastructure with fixed addresses, such as servers, controllers, network printers, access points, cameras or appliances excluded from the DHCP pool. Five further addresses in this same /24 have reference entries of their own, which fits a segment where several static assignments are in play.
Visitors usually land here after seeing 10.21.1.5 in an ARP table, a router's client list, a firewall log or a connection error, and want to establish what kind of device it is likely to be and whether it offers a management interface at all.
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 10.21.1.0/24
The 10.21.1.0/24 subnet runs from 10.21.1.1 to 10.21.1.254, with 10.21.1.255 reserved as the broadcast address. These are the addresses in it we hold router login details for.
All addresses we cover here
6 addresses in this subnet have a page; the most looked-up are listed here.