Can a SubID be lost in a redirect?

Yes. It travels in a query parameter and a redirect can drop parameters while still returning HTTP 200. Two of the three redirects observed in an 80-URL sample on 3 September 2026 dropped query parameters.

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Creator economy · Link mechanics

What is a SubID, and why should a creator use one?

Q: What is a SubID in affiliate marketing?

A label added to an affiliate link and passed through to the network, which reports it back alongside any sale. It is the only reliable way to know which post produced which sale, because networks often report no referring URL.

Q: Is a SubID the same as a UTM parameter?

No. A UTM parameter is read by your own analytics; a SubID is read by the affiliate network. Setting one does not populate the other, and they answer different questions.

Q: How many SubIDs should a single post use?

One per link when the post carries more than three or four products; otherwise one per post, which is already a large improvement on none.

The label that turns an anonymous sale into a post you can point at, and the two-minute check that it arrives intact.

Some links here are affiliate links — if you buy, the retailer may pay us a commission at no extra cost to you. We have earned $0 from them so far. Here’s how it works.

Part of: For creators

A SubID is a label you attach to an affiliate link so that when a sale comes back, you know which post produced it. Networks report sales with a timestamp, an amount and your SubID. They very often do not report a referring URL, and when they do it is the retailer's page rather than yours. Without a SubID, a sale is anonymous.

Analytics cannot fill this gap, and the reason is structural: your analytics stops at the click and the network's reporting starts at the purchase. Nothing joins the two except a string you put in the link yourself.

Wristwatch photographed by a marketplace seller against a plain background — Two posts, one product, one link. Without a label on each link, the sale that arrives next month belongs to neither of them. Image: Poshmark marketplace listing

Zero-earnings disclosure: LinkToLooks holds no affiliate network approvals and has earned $0 in commission to date. We publish no income screenshots, no creator case studies and no testimonials, because we have none. Every figure here is either computed from live data during this run and dated, or quoted from a named source, or flagged as something we could not verify.

The gap a SubID closes

System	Sees the click	Sees the sale	Knows which post
Your site or platform analytics	Yes	No	Yes, for clicks only
The affiliate network's dashboard	Partly	Yes	Only if you told it
The retailer	Yes	Yes	No, and it does not report to you
A SubID	Carried through	Reported alongside the sale	Yes

Read the last column. Every system in that table knows something, and no system except the SubID knows the thing you actually want: which piece of work earned the money.

This matters most for the creators with the least time. If you publish forty posts a quarter and eleven sales come back, the difference between knowing and not knowing which eleven posts produced them is the difference between a content plan and a guess.

A naming scheme that survives a year

The scheme matters more than people expect, because the SubID you invent in March is the SubID you have to interpret in December. Three rules:

It must be decidable at posting time without a lookup table. If you have to open a spreadsheet to know what to type, you will eventually not type it.
It must sort. Put the date first, in year-month-day order, so a plain alphabetical sort is also a chronological one.
It must survive being read by a stranger — including you, later. post12 is not a label, it is a promise to remember.

A shape that satisfies all three:

260903-ig-reel-dutchoven

260903 — date, sortable, unambiguous.
ig — platform. Two letters is enough: ig, yt, pin, li, nl for the newsletter.
reel — format, because the format comparison is the one you will want first and cannot get any other way.
dutchoven — subject, short, no spaces.

Keep it lowercase, use hyphens rather than spaces or underscores, and keep it short: networks impose their own length limits and a truncated SubID is worse than a short one because it silently collides with its neighbours. Never put anything personal in it — a SubID travels through several parties' systems and appears in reports you do not control.

Keep reading

Check that it survives the redirects

A SubID lives in a query parameter, and query parameters are not guaranteed to arrive. This is not theoretical. On 3 September 2026 we traced 80 live product URLs pulled from a retailer catalogue:

Seventy-seven redirected zero times, so nothing could be lost.
Three redirected. Two of those three dropped query parameters on the way — specifically feed_tp, keyword and network, discarded by the retailer's own redirect.
Every one of those redirects ended in a 200. The link looked perfectly healthy. The parameters were simply not there any more.

Those particular parameters are the catalogue's, not a creator's SubID, and we are not claiming a retailer would treat a network's tracking parameter the same way. The transferable point is the shape of the failure: a redirect can drop a parameter and return a healthy status code, so nothing in your dashboard will ever tell you.

The check takes two minutes and is worth doing once per programme: build a link with a SubID you would recognise, open it, and look at the address bar on the page you land on. If the label is gone, you have learned it before three months of data went missing rather than after.

Patterned throw pillow photographed square for a retailer product listing — A parameter that does not survive the trip is a label you believe you have and do not. Image: Wayfair North America product listing

Four mistakes that cost you the data

One SubID for everything. A single label across every post is the same as no label, with extra steps. If you do nothing else, separate by platform.
A different scheme every quarter. The value of the labels is comparison over time, and a scheme change resets it. Pick something you can live with and keep it.
Reusing a SubID on a second post. Cheap to do, impossible to unpick later. Two posts sharing a label are one row in your report forever.
Adding it and never reading it. The label is not the point; the quarterly look at which format and which platform actually produced sales is the point.

What a SubID still will not tell you

Why a post worked. It attributes; it does not explain. Two posts with the same SubID structure and wildly different results is where your judgement starts, not where it ends.
Anything about clicks that did not convert. The SubID surfaces in sale reporting. The people who clicked and did not buy remain invisible unless your own analytics saw them.
Which of several links in one post earned. Not unless you gave each link its own suffix, which is worth doing on any post carrying more than three or four products.
Whether the network counted it correctly. Reversals, cross-device journeys and cookie loss all happen upstream of the label.
What any of this pays. We hold no commission data and no earnings of our own — this page is about attribution mechanics, not income.

Frequently asked

What is a SubID in affiliate marketing?

A label you add to an affiliate link, passed through to the network, which reports it back alongside any sale. It is the only reliable way to know which post produced which sale.

Is a SubID the same as a UTM parameter?

No. They are read by different parties: a UTM parameter is read by your own analytics, a SubID by the affiliate network. Setting one does not populate the other.

What should a SubID look like?

Date first for sortability, then platform, then format, then subject — for example 260903-ig-reel-dutchoven. Lowercase, hyphenated, short, and never containing personal information.

Can a SubID get lost?

Yes. It travels in a query parameter, and a redirect can drop parameters while still returning a healthy 200. Two of the three redirects in our 3 September 2026 sample dropped parameters.

How many SubIDs should one post have?

One per link if the post carries more than three or four products. Otherwise one per post, which is already a large improvement on none.

Method and scope

The redirect measurement: 80 destination URLs drawn with a fixed random seed from 10,575 live in-stock listings pulled on 3 September 2026, each requested once with a desktop browser user agent, redirects recorded rather than followed automatically, and query keys compared start to finish.
The naming scheme is our recommendation, not a standard. Networks differ on length limits and permitted characters; check yours before committing to a format.
Not verified: how any specific network treats SubIDs on a redirect, since those terms sit behind publisher logins we do not hold.
We have earned $0 in affiliate commission and hold no SubID reporting of our own. This page describes the mechanism, not results.

Keep reading

Last verified 3 September 2026 against a redirect trace of 80 live product URLs sampled from this run's catalogue pull

How this guide was made. We research and draft these guides with AI, then a person checks every price, link and factual claim against the source before it publishes. We work this way because it lets us re-verify prices across hundreds of guides in a day, which is what keeps the numbers here current; it does not decide what we recommend. Anything we could not verify is labelled as unverified rather than filled in.

LinkToLooks identification desk — we identify objects out of real photographs and check every listing by eye before we link it. Empty beats wrong. About the desk · published 3 September 2026.