If you evaluate outreach sites, you need to understand a metric's history before using it to prioritize a prospect. A PageRank value tells you where a site sits in the link graph today. The history tells you how it got there, and when you are sizing up a prospect the history is the more useful of the two.
What a PageRank figure describes
PageRank measures a site's position in a link graph, worked out from the pattern of links pointing at it. It describes structure and not quality. How well connected a host is inside the graph being measured, and nothing else.
It only compares inside its own dataset, because the term covers a family of calculations and not one number. And it is not the figure any search engine uses internally, so do not read it as a prediction of how one will treat the site.
Used properly it does two jobs. It compares sites against each other inside one dataset, and it compares a site against its own past.
Three numbers come back for one site
A lookup returns the registrable domain, the host you asked about, and that host's www variant.
The host and its www variant are counted separately in the link graph and their numbers disagree. Neither one is the whole picture, so you get all three instead of somebody choosing for you.
Subdomains are separate too. blog.example.com and example.com are different hosts with different measurements, which matters when a company keeps its content on a subdomain and its marketing site somewhere else.
Why January 2026 can look like a collapse
From January 2026 the underlying graph started counting www.example.com separately from example.com. On sites served from the www hostname, the bare host's figure drops to almost nothing that month and the www figure climbs.
Here is a real one, anonymized. Through December 2025 the host measured 56 and the www host measured 0. From January 2026 the host measures 31 and the www host measures 56.
Nothing happened to the website. The measurement moved.
The charts draw the bare host up to January 2026 and the www host from that point, so the site gets one line. Apply the same rule to any rows you export. Skip it and every www-served site in your list appears to have fallen off a cliff in one month.
The history says things the current figure cannot
Three sites can report the same number this month and be three completely different prospects.
| Pattern over three years | What it suggests | Reasonable action |
|---|---|---|
| Steady, little movement | Established and holding its position | Safe to approach. Expect competition for the placement. |
| Rising consistently | Gaining links and attention | Build the relationship now, before it becomes obvious |
| Peaked, then two years of decline | Losing ground, possibly abandoned | Check whether anyone still updates it |
| Sharp drop in one month | The www change, or something real | Check which month before you conclude anything |
Row three is the one a current figure hides completely. It is common among directories and resource sites that somebody maintained for a while and then stopped.
PRoT, and when to filter on it
PRoT is PageRank over Time: the PageRank values for every month held in the graph, added together. It describes how strong a site has been across the whole period, not how strong it is today.
You use it as a filter. When you want prospects that have been established for years and not sites that climbed last spring, a minimum PRoT does that in one step. Reading monthly charts for two hundred candidates does not.
It appears as a minimum domain or host filter in the opportunity and brand page reports. The Link Graph pages show PageRank only, so once the filter has cut the list down, go to the monthly chart to see the shape behind a value.
Read the two together. High current PageRank with a low PRoT is a recent riser, which might be an opening or might be volatile. High PRoT with a falling current value is a site past its best.
Using it without overreading it
Measurements are monthly. The newest figure is the most recent completed measurement, not today, and a link you earned last week is not in it yet.
Treat the number as one input among several. A modest site that is precisely relevant to your subject and still publishing beats a large general site where your contribution disappears.
The defensible use is comparative. Order a list of prospects you already believe in. Do not decide relevance from the figure.
When a site merits further research, review its history alongside its current pages. Use both to inform the decision about investing time in a placement.
See how the measurements are produced, inspecting a prospect's history, or how to evaluate a prospect.