192.168.100.21 router login

http://192.168.100.21 ↗

To open the admin panel, type 192.168.100.21 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.

192.168.100.21 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 are no documented default username and password pairs tied to 192.168.100.21, and inventing one would be worse than useless. Since the address is not a known factory gateway, whatever answers on it was assigned the address by a DHCP server or by hand, and its credentials belong to that device rather than to the address. Look for them where the maker prints them: the label or sticker on the underside or rear of the unit, the quick-start card in the box, the product manual, or the documentation supplied by an internet provider for equipment they installed.

How to log in to your router

  1. Type 192.168.100.21 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.

  2. If the browser reports that it cannot reach 192.168.100.21, 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".

  3. 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 login is unknown, first identify the hardware behind the address using the router's DHCP client list or ARP table, then consult that device's own manual for its reset procedure, since hold times and button locations differ between products. A factory reset is not free: it usually clears the administrator password along with Wi-Fi names and keys, port forwarding, static leases, VLANs and any provider-specific provisioning, and the device may come back on a DHCP-assigned address rather than 192.168.100.21. Export or photograph the configuration first, and keep provider account details to hand for re-provisioning.

192.168.100.21 is a private IPv4 address from the 192.168.0.0/16 range that RFC 1918 sets aside for internal use. That block holds 65,536 addresses under the netmask 255.255.0.0, and it is the consumer range: nearly every home router, mobile hotspot and small office access point ships a default gateway inside it, which is why it is the range most people encounter. Because the space is private and reusable, the same address is in use on countless unrelated networks at once. It has no owner, registrant or location, and traffic addressed to it never leaves the local network.

Within that range the address falls in the 192.168.100.0/24 subnet, whose usable hosts run from 192.168.100.1 to 192.168.100.254, with 192.168.100.255 reserved for broadcast. It is the twenty-first usable address in that subnet, away from the first and last positions routers commonly take, so a device answering here is more often a client or secondary appliance than the gateway: a printer, camera, storage device, access point or server holding a DHCP reservation. No specific vendor is known to ship 192.168.100.21 as a default gateway.

Most people reaching this address have seen it in a router's client list, a network scan or a device display, and want to know what is listening at http://192.168.100.21 and how to sign in.

Block192.168.0.0/16
Netmask255.255.0.0
Subnet192.168.100.0/24
Usable192.168.100.1 – 192.168.100.254

Whois information for 192.168.0.0/16
#
# 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: 192.168.0.0 - 192.168.255.255
CIDR: 192.168.0.0/16
NetName: PRIVATE-ADDRESS-CBLK-RFC1918-IANA-RESERVED
NetHandle: NET-192-168-0-0-1
Parent: NET192 (NET-192-0-0-0-0)
NetType: IANA Special Use
OriginAS:
Organization: Internet Assigned Numbers Authority (IANA)
RegDate: 1994-03-15
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/192.168.0.0



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 192.168.100.0/24

The 192.168.100.0/24 subnet runs from 192.168.100.1 to 192.168.100.254, with 192.168.100.255 reserved as the broadcast address. These are the addresses in it we hold router login details for.

Most looked up in this subnet

192.168.100.4 192.168.100.1 192.168.100.5 192.168.100.3 192.168.100.6 192.168.100.2 192.168.100.7 192.168.100.8

All addresses we cover here
192.168.100.1 192.168.100.2 192.168.100.3 192.168.100.4 192.168.100.5 192.168.100.6 192.168.100.7 192.168.100.8 192.168.100.9 192.168.100.10 192.168.100.11 192.168.100.12 192.168.100.13 192.168.100.14 192.168.100.15 192.168.100.16 192.168.100.17 192.168.100.18 192.168.100.19 192.168.100.20 192.168.100.22 192.168.100.23 192.168.100.24 192.168.100.25 192.168.100.26 192.168.100.27 192.168.100.29 192.168.100.32 192.168.100.33 192.168.100.34 192.168.100.36 192.168.100.37 192.168.100.39 192.168.100.40 192.168.100.47 192.168.100.52 192.168.100.53 192.168.100.54 192.168.100.56 192.168.100.57 192.168.100.58 192.168.100.62 192.168.100.68 192.168.100.72 192.168.100.75 192.168.100.76 192.168.100.81 192.168.100.83 192.168.100.90 192.168.100.99 192.168.100.102 192.168.100.104 192.168.100.117 192.168.100.133 192.168.100.136 192.168.100.141 192.168.100.156 192.168.100.164 192.168.100.178 192.168.100.200

255 addresses in this subnet have a page; the most looked-up are listed here.