Accessing Multiple IP Address Facts in Jinja2 template

I want to access this part of setup:

    "ansible_venet0:0": {
        "ipv4": {
            "address": "64.207.149.43",
            "netmask": "255.255.255.255",
            "network": "64.207.149.43"
        },
        "macaddress": "00:00:00:00:00:00"
    },

but clearly, {{ ansible_venet0:0["ipv4"]["address"] }} just won't
work.

Please let me know a better way of going about this.

Thanks,
Keith