What are the common router default DHCP IP address ranges?

Solution 1:

They will only be within

http://tools.ietf.org/html/rfc1918

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

And that's not just the defaults, that's all you can set them to too. Those are the 3 private IP ranges. As specified by RFC 1918

Now, as far as what is common. That could change in future. But from what i've seen, the 192.168/16 range is most common.

Second to that is the 10/8 range. I've seen that too, as you have. It's not uncommon

And I've never seen a router set to use anything on 172.16/12 but they could.

Solution 2:

The vast majority are set to 192.168.1/24. Additionally, some also default to 192.168.0/24 and then there are a very small number that default to 10.1.1/24 or 10.0.0/24.

(The final octet of the gateway IP {the router's IP address} is almost always .1, although I've seen a few that were defaulted to .254 over the years.)

Solution 3:

Here is a list which I compiled for http://localrouter.net

Mostly culled from http://www.techspot.com/guides/287-default-router-ip-addresses/

    var commonDefaults = {  // used by...
        "cellspot.router":  "T-Mobile (ASUS)",
        "10.0.0.1":         "Cisco, D-Link, Sitecom, SMC",
        "10.0.0.2":         "Belkin, Billion, Cisco, D-Link, Siemens, Zoom, Zyxel",
        "10.0.0.138":       "2Wire, Huawei, NetComm, Siemens, SpeedTouch, Zoom, Zyxel",
        "10.0.1.1":         "Apple", // no HTTP
        "10.0.10.1":        "SMC",
        "10.1.1.1":         "Belkin, D-Link",
        "10.10.1.1":        "Asus",
        "10.90.90.90":      "D-Link",
        "172.16.0.1":       "",
        "172.16.1.1":       "",
        "192.168.0.1":      "2Wire, Actiontec, D-Link, Eminent, Huawei, LevelOne, Linksys, Netgear, Planet, Senao, Siemens, Sitecom, SMC, Tenda, Thomson, TP-Link, Trendnet, ZTE, Zyxel",
        "192.168.0.3":      "Sonicwall",
        "192.168.0.10":     "D-Link",
        "192.168.0.30":     "Cisco, D-Link, Trendnet",
        "192.168.0.50":     "Cisco, D-Link",
        "192.168.0.100":    "Trendnet",
        "192.168.0.101":    "D-Link",
        "192.168.0.277":    "Netgear",
        "192.168.0.254":    "TP-Link",
        "192.168.1.1":      "2Wire, 3Com, Actiontec, Airlink, Asus, Aztech, Belkin, Buffalo, Dell, Cisco, D-Link, Eminent, Huawei, Linksys, NetComm, Planet, Repotec, Siemens, SMC, Tenda, TP-Link, Trendnet, USR, Zoom, ZTE, Zyxel, Motorola, Planet, Repotec",
        "192.168.1.10":     "Linksys",
        "192.168.1.99":     "Linksys",
        "192.168.1.100":    "Trendnet",
        "192.169.1.200":    "Hawking",
        "192.168.1.210":    "Linksys",
        "192.168.1.254":    "2Wire, Asus, Aztech, Billion, D-Link, Gigabyte, Hawking, Linksys, Motorola, MSI, Netopia, Planet, Siemens, Sitecom, SpeedTouch, Thomson, Trendnet, Zoom, Zyxel",
        "192.168.2.1":      "Actiontec, Airlink, Airlive, Airties, Asus, Aztech, Belkin, Edimax, Linksys, Microsoft, Siemens, SMC, Trendnet, USR, Zoom, ZTE, Zyxel",
        "192.168.2.254":    "ZTE",
        "192.168.3.1":      "Amped, Huawei",
        "192.168.4.1":      "Zoom, Zyxel",
        "192.168.8.1":      "Eminent, Huawei",
        "192.168.10.1":     "3Com, Motorola, Repotec, Trendnet, Zoom, Zyxel",
        "192.168.10.10":    "Trendnet",
        "192.168.10.50":    "NetComm",
        "192.168.10.100":   "Trendnet",
        "192.168.11.1":     "Buffalo",
        "192.168.15.1":     "D-Link: Linksys: Motorola: Sweex",
        "192.168.16.1":     "Linksys: Repotec",
        "192.168.20.1":     "Motorola: NetComm",
        "192.168.29.1":     "Asus",
        "192.168.30.1":     "Motorola",
        "192.168.50.1":     "Sweex",
        "192.168.55.1":     "Sweex",
        "192.168.62.1":     "Motorola",
        "192.168.100.1":    "Motorola, Huawei, Thomson",
        "192.168.100.100":  "ZTE",
        "192.168.102.1":    "Motorola",
        "192.168.123.254":  "LevelOne, Repotec, Sitecom, USR",
        "192.168.168.168":  "Sonicwall",
        "192.168.223.100":  "Trendnet",
        "192.168.251.1":    "Sweex",
        "192.168.254.254":  "Actiontec, Aztech, D-Link, Siemens, Zyxel"
    };