NPA 866
Opened 2000. The third-most-saturated prefix.
About NPA 866
866 came online in 2000 and has been a workhorse for two decades. About 92% of its inventory is in use, with the remaining spare pool serving as a modest buffer.
Status decomposition over time
Every toll free number sits in exactly one status: working (in active use), assigned (allocated but not yet routing), reserved (held briefly during pickup), disconnect (aging out before returning to spare), transit (mid-port between RespOrgs), unavailable (held by Somos), or suspend. Watch the mix shift as the prefix has matured.
- Working7.0M
- Assigned2
- Reserved5K
- Disconnect74K
- Transit67K
- Unavail2K
- Suspend0
Fill % over time
Percentage of NPA 866's 7,980,000 (or 7,870,094 for 800) total possible numbers that are currently in use. 100% means every assignable number has been claimed.
Top RespOrgs holding NPA 866
Ten RespOrgs sit on most of NPA 866's working inventory. Click any name for their full profile: trajectory, opportunism index, vanity holdings, and how their NPA mix compares to the industry total above.
| RespOrg | Numbers in NPA 866 | Share of working inventory |
|---|---|---|
| Verizon Business (VZ) | 1,294,186 | 18.5% |
| Bandwidth (JY) | 814,756 | 11.6% |
| Twilio (TW) | 782,002 | 11.2% |
| Mayfair Communication (MY) | 385,986 | 5.5% |
| AT&T (AT) | 365,577 | 5.2% |
| Signal One (SO) | 255,085 | 3.6% |
| Inteliquent (JF) | 195,492 | 2.8% |
| Lumen Technologies (KS) | 174,492 | 2.5% |
| Invoca (YV) | 173,523 | 2.5% |
| Opentext (FP) | 163,634 | 2.3% |