L'indirizzo IP 128.91.12 è fornito da University of Pennsylvania, che è di proprietà del CIDR (Classless Inter-Domain Routing) 128.91.0.0/16, IP tra 128.91.0.0 a 128.91.255.255 ). Il numero di sistema autonomo (ASN) è 55.
| ASN | 55 |
| IP inizia con | 128.91.0.0 |
| IP finale con | 128.91.255.255 |
| ASN Nome | University of Pennsylvania |
| CDIR | 128.91.0.0/16 |
| IP numerico | |
| Registe | arin |
| Ultimo aggiornamento | 26/01/2018 |

| Codice paese | Paese | Regione | Città | Latitude | Longitude | Ultimo aggiornamento | |
| IP2Location | US | United States | - | Philadelphia | 39,961 | -75,1998 | 2018-01-26 |
| MaxMind | US | United States | - | Philadelphia | 39,9597 | -75,1968 | 2018-01-26 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |
| IP | Numerical IP | DNS |
| 128.91.12.0 | 2153450496 | 0 |
| 128.91.12.1 | 2153450497 | 0 |
| 128.91.12.2 | 2153450498 | 0 |
| 128.91.12.3 | 2153450499 | 0 |
| 128.91.12.4 | 2153450500 | 0 |
| 128.91.12.5 | 2153450501 | 0 |
| 128.91.12.6 | 2153450502 | 0 |
| 128.91.12.7 | 2153450503 | 0 |
| 128.91.12.8 | 2153450504 | 0 |
| 128.91.12.9 | 2153450505 | 0 |
| 128.91.12.10 | 2153450506 | 0 |
| 128.91.12.11 | 2153450507 | 0 |
| 128.91.12.12 | 2153450508 | 0 |
| 128.91.12.13 | 2153450509 | 0 |
| 128.91.12.14 | 2153450510 | 0 |
| 128.91.12.15 | 2153450511 | 0 |
| 128.91.12.16 | 2153450512 | 0 |
| 128.91.12.17 | 2153450513 | 0 |
| 128.91.12.18 | 2153450514 | 0 |
| 128.91.12.19 | 2153450515 | 0 |
| 128.91.12.20 | 2153450516 | 0 |
| 128.91.12.21 | 2153450517 | 0 |
| 128.91.12.22 | 2153450518 | 0 |
| 128.91.12.23 | 2153450519 | 0 |
| 128.91.12.24 | 2153450520 | 0 |
| 128.91.12.25 | 2153450521 | 0 |
| 128.91.12.26 | 2153450522 | 0 |
| 128.91.12.27 | 2153450523 | 0 |
| 128.91.12.28 | 2153450524 | 0 |
| 128.91.12.29 | 2153450525 | 0 |
| 128.91.12.30 | 2153450526 | 0 |
| 128.91.12.31 | 2153450527 | 0 |
| 128.91.12.32 | 2153450528 | 0 |
| 128.91.12.33 | 2153450529 | 0 |
| 128.91.12.34 | 2153450530 | 0 |
| 128.91.12.35 | 2153450531 | 0 |
| 128.91.12.36 | 2153450532 | 0 |
| 128.91.12.37 | 2153450533 | 0 |
| 128.91.12.38 | 2153450534 | 0 |
| 128.91.12.39 | 2153450535 | 0 |
| 128.91.12.40 | 2153450536 | 0 |
| 128.91.12.41 | 2153450537 | 0 |
| 128.91.12.42 | 2153450538 | 0 |
| 128.91.12.43 | 2153450539 | 0 |
| 128.91.12.44 | 2153450540 | 0 |
| 128.91.12.45 | 2153450541 | 0 |
| 128.91.12.46 | 2153450542 | 0 |
| 128.91.12.47 | 2153450543 | 0 |
| 128.91.12.48 | 2153450544 | 0 |
| 128.91.12.49 | 2153450545 | 0 |
| 128.91.12.50 | 2153450546 | 0 |
| 128.91.12.51 | 2153450547 | 0 |
| 128.91.12.52 | 2153450548 | 0 |
| 128.91.12.53 | 2153450549 | 0 |
| 128.91.12.54 | 2153450550 | 0 |
| 128.91.12.55 | 2153450551 | 0 |
| 128.91.12.56 | 2153450552 | 0 |
| 128.91.12.57 | 2153450553 | 0 |
| 128.91.12.58 | 2153450554 | 0 |
| 128.91.12.59 | 2153450555 | 0 |
| 128.91.12.60 | 2153450556 | 0 |
| 128.91.12.61 | 2153450557 | 0 |
| 128.91.12.62 | 2153450558 | 0 |
| 128.91.12.63 | 2153450559 | 0 |
| 128.91.12.64 | 2153450560 | 0 |
| 128.91.12.65 | 2153450561 | 0 |
| 128.91.12.66 | 2153450562 | 0 |
| 128.91.12.67 | 2153450563 | 0 |
| 128.91.12.68 | 2153450564 | 0 |
| 128.91.12.69 | 2153450565 | 0 |
| 128.91.12.70 | 2153450566 | 0 |
| 128.91.12.71 | 2153450567 | 0 |
| 128.91.12.72 | 2153450568 | 0 |
| 128.91.12.73 | 2153450569 | 0 |
| 128.91.12.74 | 2153450570 | 0 |
| 128.91.12.75 | 2153450571 | 0 |
| 128.91.12.76 | 2153450572 | 0 |
| 128.91.12.77 | 2153450573 | 0 |
| 128.91.12.78 | 2153450574 | 0 |
| 128.91.12.79 | 2153450575 | 0 |
| 128.91.12.80 | 2153450576 | 0 |
| 128.91.12.81 | 2153450577 | 0 |
| 128.91.12.82 | 2153450578 | 0 |
| 128.91.12.83 | 2153450579 | 0 |
| 128.91.12.84 | 2153450580 | 0 |
| 128.91.12.85 | 2153450581 | 0 |