Generating and printing a range of ip addresses

Here's a generator function that works with two strings containing valid IP
addresses.
(Note: no error checking, such as verifying that endAddr > startAddr,
endAddr < 255.255.255.255, etc.)

def ipAddrRange(startAddr, endAddr):
    def incrAddr(addrList):
        addrList[3] += 1
        for i in (3,2,1):
            if addrList[i] == 256:
                addrList[i] = 0
                addrList[i-1] += 1

    def asString(addrList):
        return ".".join(map(str,addrList))

    startAddrList = map(int,startAddr.split("."))
    endAddrList = map(int,endAddr.split("."))

    curAddrList = startAddrList[:]
    yield asString(curAddrList)
    for i in range(4):
        while curAddrList[i] < endAddrList[i]:
            incrAddr(curAddrList)
            yield asString(curAddrList)

for addr in ipAddrRange("10.255.255.250","11.0.0.20"):
    print addr