NPA 877
Opened 1998. Mostly full, modest spare cushion.
About NPA 877
877 launched in 1998 as the third toll-free prefix. It now sits in the high 80s percent in use — most assignments come from the spare pool but the cushion is shrinking each year.
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.
- Working6.5M
- Assigned1
- Reserved4K
- Disconnect55K
- Transit170K
- Unavail2K
- Suspend0
Fill % over time
Percentage of NPA 877'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 877
Ten RespOrgs sit on most of NPA 877'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 877 | Share of working inventory |
|---|---|---|
| Bandwidth (JY) | 1,142,415 | 17.6% |
| Verizon Business (VZ) | 949,090 | 14.6% |
| Twilio (TW) | 676,443 | 10.4% |
| Mayfair Communication (MY) | 391,302 | 6.0% |
| AT&T (AT) | 298,067 | 4.6% |
| Signal One (SO) | 288,921 | 4.5% |
| Inteliquent (LQ) | 236,416 | 3.6% |
| Invoca (YV) | 174,430 | 2.7% |
| Toll Free Management (MT) | 170,238 | 2.6% |
| Interactive RespOrg Management (IU) | 122,202 | 1.9% |