diff --git a/README.md b/README.md
index 3a1398c..de298c9 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1697 TILs and counting..._
+_1698 TILs and counting..._
 
 See some of the other learning resources I work on:
 
@@ -1617,6 +1617,7 @@ If you've learned something here, support my efforts writing daily TILs by
 - [Curl With Cookies](unix/curl-with-cookies.md)
 - [Curling For Headers](unix/curling-for-headers.md)
 - [Curling With Basic Auth Credentials](unix/curling-with-basic-auth-credentials.md)
+- [Determine ipv4 And ipv6 Public IP Addresses](unix/determine-ipv4-and-ipv6-public-ip-addresses.md)
 - [Different Ways To Generate A v4 UUID](unix/different-ways-to-generate-a-v4-uuid.md)
 - [Display All The Terminal Colors](unix/display-all-the-terminal-colors.md)
 - [Display Free Disk Space](unix/display-free-disk-space.md)
diff --git a/unix/determine-ipv4-and-ipv6-public-ip-addresses.md b/unix/determine-ipv4-and-ipv6-public-ip-addresses.md
new file mode 100644
index 0000000..e0d0641
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+++ b/unix/determine-ipv4-and-ipv6-public-ip-addresses.md
@@ -0,0 +1,29 @@
+# Determine ipv4 And ipv6 Public IP Addresses
+
+There are a number of ways to do this. The one that I've settled on is sending a
+`curl` request to a public URL that was specifically set up to echo back the
+public IP of the device making the request. There are many such URLs, but the
+one that I tend to use is `ifconfig.io`.
+
+When I run this as is, I get something like the following which you may
+recognize as an _ipv6_ IP address.
+
+```bash
+$ curl ifconfig.io
+2001:db8:3333:4444:5555:6666:7777:8888
+```
+
+This is because if ipv6 is available, like it is for me, `curl` is going to
+prefer that.
+
+Now, if I'm trying to track down specifically my ipv4 address, I can use the
+`-4` flag (or `--ipv4`).
+
+```bash
+$ curl -4 ifconfig.io
+73.23.45.157
+```
+
+Similarly, I could explicitly specify ipv6 with `-6` or `--ipv6`.
+
+See `man curl` for more details.